--- title: 'Gemini 3.1 Flash-Lite API: Model ID, 1M Context, OpenAI SDK | RunAPI' description: Call gemini-3.1-flash-lite through RunAPI's OpenAI-compatible Chat Completions API. 1M-token context, 65K output, adjustable thinking, text input. url: https://runapi.ai/models/gemini/3.1-flash-lite.md canonical: https://runapi.ai/models/gemini/3.1-flash-lite locale: en site: RunAPI image: https://runapi.ai/assets/opengraph-bfaaa0f0.png alternates: en: https://runapi.ai/models/gemini/3.1-flash-lite zh-CN: https://runapi.ai/zh-CN/models/gemini/3.1-flash-lite es: https://runapi.ai/es/models/gemini/3.1-flash-lite ja: https://runapi.ai/ja/models/gemini/3.1-flash-lite de: https://runapi.ai/de/models/gemini/3.1-flash-lite fr: https://runapi.ai/fr/models/gemini/3.1-flash-lite pt-BR: https://runapi.ai/pt-BR/models/gemini/3.1-flash-lite ko: https://runapi.ai/ko/models/gemini/3.1-flash-lite it: https://runapi.ai/it/models/gemini/3.1-flash-lite nl: https://runapi.ai/nl/models/gemini/3.1-flash-lite pl: https://runapi.ai/pl/models/gemini/3.1-flash-lite tr: https://runapi.ai/tr/models/gemini/3.1-flash-lite zh-TW: https://runapi.ai/zh-TW/models/gemini/3.1-flash-lite zh-HK: https://runapi.ai/zh-HK/models/gemini/3.1-flash-lite ar: https://runapi.ai/ar/models/gemini/3.1-flash-lite x-default: https://runapi.ai/models/gemini/3.1-flash-lite model: Gemini provider: Google variant_id: gemini-3.1-flash-lite sdk_model_id: gemini-3.1-flash-lite modality: text billing_unit: 1K tokens status: active --- > HTML version: https://runapi.ai/models/gemini/3.1-flash-lite > Site index for agents: https://runapi.ai/llms.txt # gemini-3.1-flash-lite API Call gemini-3.1-flash-lite from the Gemini family through RunAPI. Billing is per token with no subscription, and a request that fails before its response starts is not charged. **Google / [Gemini](https://runapi.ai/models/gemini.md)** **Operational · text · Commercial OK** ## What Gemini 3.1 Flash-Lite is built for Gemini 3.1 Flash-Lite is the low-latency, low-cost model of Google's Gemini 3 series. Google builds it for simple tasks at high volume, such as translation, classification and entity extraction, document triage, and routing requests between models. The stable gemini-3.1-flash-lite reached general availability on May 7, 2026. The context window is 1,048,576 tokens and output goes up to 65,536 tokens. Thinking is adjustable: Google offers four thinking levels, from minimal to high, and counts thinking tokens as output. Google supports function calling and structured outputs on the model. Google's model accepts text, image, video, audio, and PDF input. On RunAPI, gemini-3.1-flash-lite accepts text input only. Send requests through the OpenAI-compatible Chat Completions endpoint (/v1/chat/completions), OpenAI Responses, Anthropic Messages, or Gemini generateContent. Google names Gemini 3.5 Flash-Lite as the replacement, and RunAPI lists it as gemini-3.5-flash-lite. **Model ID:** gemini-3.1-flash-lite **Released:** May 7, 2026 (general availability) **Context window:** 1,048,576 tokens **Max output:** 65,536 tokens **Thinking:** Adjustable, minimal to high **Earliest shutdown (Google):** May 7, 2027 **Endpoint on RunAPI:** OpenAI Chat Completions, text input ## Try Gemini 3.1 Flash-Lite Pick any model and generate in seconds. **Model:** - **Chat completion** — `chat_completion` · `gemini-3.1-flash-lite` · Input $0.25 / 1M tokens | Output $1.50 / 1M tokens **Prompt:** Describe what you want to create... **Estimated:** Input $0.25 / 1M tokens | Output $1.50 / 1M tokens - [Generate](https://runapi.ai/login) Sign in to generate with RunAPI. ### Switch variant - [gemini-2.5-flash](https://runapi.ai/models/gemini/2.5-flash.md) - [gemini-2.5-flash-lite](https://runapi.ai/models/gemini/2.5-flash-lite.md) - [gemini-2.5-pro](https://runapi.ai/models/gemini/2.5-pro.md) - [gemini-3-flash-preview](https://runapi.ai/models/gemini/3-flash-preview.md) - **gemini-3.1-flash-lite** (current) - [gemini-3.1-pro-preview](https://runapi.ai/models/gemini/3.1-pro-preview.md) - [gemini-3.5-flash](https://runapi.ai/models/gemini/3.5-flash.md) - [gemini-3.5-flash-lite](https://runapi.ai/models/gemini/3.5-flash-lite.md) - [gemini-3.6-flash](https://runapi.ai/models/gemini/3.6-flash.md) - [gemini-3.7-flash](https://runapi.ai/models/gemini/3.7-flash.md) - [gemini-3.8-flash](https://runapi.ai/models/gemini/3.8-flash.md) 11 versions available gemini-3.1-flash-lite is one of the Gemini models on RunAPI. It uses the same API key as every other model, and you switch to it by changing the model ID in your request. Each call is synchronous and billed in USD by input, output, and cache tokens, with no subscription or minimum spend. A request that fails before the response starts is not charged; once a response is streaming, the tokens already generated are billed, even if the client disconnects. - Per-token billing in USD with no subscription - No charge when a request fails before its response starts - Token-by-token streaming - Switch models by changing one model ID - One API key and one bill for every model and provider ## Usage metrics - **API Calls / Day:** 6 - **Success Rate:** 100.0% - **Avg Generation:** 1.9s Verified customer feedback is not available for this model yet. ## Technical details | Field | Value | |---|---| | Provider | Google | | Model ID | gemini-3.1-flash-lite | | Modality | Text | | Task types | Synchronous | | API endpoint | `/v1/chat/completions` | | | `/v1/responses` | | | `/v1/messages` | | | `/v1beta/models/gemini-3.1-flash-lite:generateContent` | | | `/v1beta/models/gemini-3.1-flash-lite:streamGenerateContent` | | Billing unit | 1K tokens | | Catalog status | Operational | **HOW IT WORKS** ## Use This Model in 3 Steps 1. **Get Your Key** - Sign up for free and create an API key for gemini-3.1-flash-lite from the dashboard. 2. **Send a Request** - POST to /v1/chat/completions with the gemini-3.1-flash-lite model slug and your parameters. 3. **Get Results** - Read the completed gemini-3.1-flash-lite response directly from the endpoint. ## What this model offers - **Endpoint coverage** — Exposes 1 public endpoint(s): chat_completion. - **Usage-based billing** — Metered by 1K tokens with no subscription requirement. ## Gemini 3.1 Flash-Lite Pricing | Endpoint | Price | |---|---| | `chat_completion` | Input: $0.25 / 1M tokens
Output: $1.50 / 1M tokens
Cache read: $0.03 / 1M tokens | **API REFERENCE** ## Endpoint Specification | Field | Value | |---|---| | Endpoint | `POST /v1/chat/completions` | | Model ID | `gemini-3.1-flash-lite` | | Task Types | `chat_completion` | ## Request parameters No request parameters are published for this endpoint. **Request example** ```json { "model": "gemini-3.1-flash-lite", "messages": [ { "role": "user", "content": "Analyze this codebase and suggest three performance improvements with before/after examples." } ] } ``` ### Model skill — gemini-3.1-flash-lite Install the skill once, then use the variant ID from this page while building. Base URL: `https://runapi.ai` | Endpoint | Protocol | |---|---| | `POST /v1/chat/completions` | OpenAI compatible | | `POST /v1/responses` | OpenAI Responses | | `POST /v1/messages` | Anthropic compatible | | `POST /v1beta/models/gemini-3.1-flash-lite:generateContent` | Gemini generateContent | | `POST /v1beta/models/gemini-3.1-flash-lite:streamGenerateContent` | Gemini streamGenerateContent | Use the OpenAI / Anthropic / Google Gen AI SDK with your RunAPI API key and `model: "gemini-3.1-flash-lite"`. ### Use gemini-3.1-flash-lite with a model skill 1. **Install** — Install the model skill for the Gemini line. It loads docs, request formats, and pricing notes into your coding workspace. 2. **Configure** — Point your SDK at https://runapi.ai and set your RunAPI API key. The same key works for every model and provider. 3. **Call** — Send a request in an API format this model supports, with the model field set to the model ID on this page. RunAPI forwards it to the provider. 4. **Receive** — Read the response from the same call, or stream it as it is generated. The usage field shows the tokens you are billed for. ### What's different about gemini-3.1-flash-lite - **VS GEMINI-2.5-FLASH: Gemini 3.1 Flash-Lite; 1M context, adjustable thinking; text requests through OpenAI-compatible Chat Completions** — Speed/cost optimized; 1M context; older generation baseline - **VS GEMINI-2.5-FLASH-LITE: Gemini 3.1 Flash-Lite; 1M context, adjustable thinking; text requests through OpenAI-compatible Chat Completions** — Gemini 2.5 Flash-Lite; 1M context, thinking off by default; OpenAI-compatible Chat Completions - **VS GEMINI-2.5-PRO: Gemini 3.1 Flash-Lite; 1M context, adjustable thinking; text requests through OpenAI-compatible Chat Completions** — Best reasoning in 2.5 gen; 1M context ## USE CASES **Customer support** Answer customer questions from a private knowledge base, reducing ticket volume. **Document analysis** Draft contract summaries and flag key clauses for attorney review. **Code generation** Auto-generate unit tests, code reviews, and refactoring suggestions in CI. ## Frequently asked questions about Gemini 3.1 Flash-Lite ### Should I use Gemini 3.1 Flash-Lite or Gemini 3.5 Flash-Lite? Google names Gemini 3.5 Flash-Lite as the replacement for 3.1 Flash-Lite. Start new projects on gemini-3.5-flash-lite, and choose gemini-3.1-flash-lite when an existing workload, prompt set, or evaluation was built on it. Both models are on RunAPI under the same API key. ### How long will Gemini 3.1 Flash-Lite be available? Google lists May 7, 2027 as the earliest shutdown date for gemini-3.1-flash-lite. The preview model was shut down in May 2026, so use the stable model ID. ### Can I call Gemini 3.1 Flash-Lite with the OpenAI SDK? Yes. Point the OpenAI SDK at https://runapi.ai/v1 with your RunAPI API key and send Chat Completions requests with model set to gemini-3.1-flash-lite. Tools use the standard OpenAI tools format. ### Can I send images or audio to gemini-3.1-flash-lite on RunAPI? Not yet. Google's model reads images, video, audio, and PDFs, but RunAPI accepts text input only for gemini-3.1-flash-lite, and requests with media parts are rejected. ### How do I select gemini-3.1-flash-lite? Pass the model ID shown in the quickstart. ### What's the rate limit on this variant? Per-key rate limits scale with your usage tier. The pricing page shows current limits. If you need higher throughput, contact support to discuss tier upgrades. ### Can I switch variants later? Yes. Variant is a parameter in the request. Switch by changing the model ID — no code changes, no re-authentication, no separate billing setup. All variants share the same API key and request shape. ### Does it stream? Where streaming is available, RunAPI streams end-to-end. LLM models support token-level streaming. Media models use async task polling or webhook callbacks for result delivery. ### Where do I report quality issues? Open an issue on the public GitHub repo or email support at contact@runapi.ai. Include the task ID and model ID so the team can investigate the specific generation. ### Do I need a separate provider account? No. Your RunAPI API key is enough to access this variant and every other model in the catalog. You do not need accounts with the underlying provider. ### RELATED - [gemini-2.5-flash-lite](https://runapi.ai/models/gemini/2.5-flash-lite.md) — by Google · Input $0.10 / 1M tokens | Output $0.40 / 1M tokens - [gemini-3.5-flash-lite](https://runapi.ai/models/gemini/3.5-flash-lite.md) — by Google · Input $0.15 / 1M tokens | Output $1.25 / 1M tokens - [gemini-2.5-flash](https://runapi.ai/models/gemini/2.5-flash.md) — by Google · Input $0.30 / 1M tokens | Output $2.50 / 1M tokens - [gemini-3-flash-preview](https://runapi.ai/models/gemini/3-flash-preview.md) — by Google · Input $0.50 / 1M tokens | Output $3.00 / 1M tokens · Input $0.30 / 1M tokens | Output $1.80 / 1M tokens ### Start building with Gemini. - [Create free account](https://runapi.ai/login) - [Read the quickstart →](https://runapi.ai/docs/api/openai/chat-completions) ## Building with a team? We're here to help with enterprise setup, integrations, and technical questions. [Contact Us](https://runapi.ai/contact.md) --- ## More from RunAPI - [Home](https://runapi.ai/.md) ### Product - [Model Catalog](https://runapi.ai/models.md) - [Pricing](https://runapi.ai/pricing.md) - [Providers](https://runapi.ai/models#all-models) ### Developers - [Documentation](https://runapi.ai/docs/guides) - [SDKs](https://runapi.ai/sdk.md) - [CLI](https://runapi.ai/cli.md) - [MCP Server](https://runapi.ai/mcp.md) - [x402](https://runapi.ai/x402.md) ### Guides - [Claude Code vs Cursor](https://runapi.ai/claude-code-vs-cursor.md) - [Cursor API Setup](https://runapi.ai/cursor-api-setup.md) - [RunAPI vs OpenRouter](https://runapi.ai/openrouter-alternative.md) ### Company - [Enterprise](https://runapi.ai/contact.md) - [Contact](https://runapi.ai/contact.md) ### Legal - [Terms](https://runapi.ai/terms.md) - [Privacy](https://runapi.ai/privacy.md) - [Site index for agents](https://runapi.ai/llms.txt) Contact: contact@runapi.ai ## Structured data ```json [ { "@context": "https://schema.org", "inLanguage": "en", "@type": "WebSite", "name": "RunAPI", "url": "https://runapi.ai/", "potentialAction": { "@type": "SearchAction", "target": { "@type": "EntryPoint", "urlTemplate": "https://runapi.ai/models?q={search_term_string}" }, "query-input": "required name=search_term_string" } }, { "@context": "https://schema.org", "inLanguage": "en", "@type": "Organization", "name": "RunAPI", "url": "https://runapi.ai/", "logo": { "@type": "ImageObject", "url": "https://runapi.ai/icon.svg" }, "sameAs": [ "https://github.com/runapi-ai" ] }, { "@context": "https://schema.org", "inLanguage": "en", "@type": "SoftwareApplication", "name": "Gemini gemini-3.1-flash-lite", "applicationCategory": "DeveloperApplication" }, { "@context": "https://schema.org", "inLanguage": "en", "@type": "BreadcrumbList", "itemListElement": [ { "@type": "ListItem", "position": 1, "name": "Home", "item": "https://runapi.ai/" }, { "@type": "ListItem", "position": 2, "name": "Models", "item": "https://runapi.ai/models" }, { "@type": "ListItem", "position": 3, "name": "Gemini", "item": "https://runapi.ai/models/gemini" }, { "@type": "ListItem", "position": 4, "name": "gemini-3.1-flash-lite", "item": "https://runapi.ai/models/gemini/3.1-flash-lite" } ] }, { "@context": "https://schema.org", "inLanguage": "en", "@type": "HowTo", "name": "Use gemini-3.1-flash-lite with a model skill", "description": "Call gemini-3.1-flash-lite from the Gemini family through RunAPI: per-token pricing, model ID, supported API formats, and setup guide.", "totalTime": "PT5M", "step": [ { "@type": "HowToStep", "position": 1, "name": "Install", "text": "Install the model skill for the Gemini line. It loads docs, request formats, and pricing notes into your coding workspace.", "url": "https://runapi.ai/models/gemini/3.1-flash-lite#how-step-1" }, { "@type": "HowToStep", "position": 2, "name": "Configure", "text": "Point your SDK at https://runapi.ai and set your RunAPI API key. The same key works for every model and provider.", "url": "https://runapi.ai/models/gemini/3.1-flash-lite#how-step-2" }, { "@type": "HowToStep", "position": 3, "name": "Call", "text": "Send a request in an API format this model supports, with the model field set to the model ID on this page. RunAPI forwards it to the provider.", "url": "https://runapi.ai/models/gemini/3.1-flash-lite#how-step-3" }, { "@type": "HowToStep", "position": 4, "name": "Receive", "text": "Read the response from the same call, or stream it as it is generated. The usage field shows the tokens you are billed for.", "url": "https://runapi.ai/models/gemini/3.1-flash-lite#how-step-4" } ] }, { "@context": "https://schema.org", "inLanguage": "en", "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "Should I use Gemini 3.1 Flash-Lite or Gemini 3.5 Flash-Lite?", "acceptedAnswer": { "@type": "Answer", "text": "Google names Gemini 3.5 Flash-Lite as the replacement for 3.1 Flash-Lite. Start new projects on gemini-3.5-flash-lite, and choose gemini-3.1-flash-lite when an existing workload, prompt set, or evaluation was built on it. Both models are on RunAPI under the same API key." } }, { "@type": "Question", "name": "How long will Gemini 3.1 Flash-Lite be available?", "acceptedAnswer": { "@type": "Answer", "text": "Google lists May 7, 2027 as the earliest shutdown date for gemini-3.1-flash-lite. The preview model was shut down in May 2026, so use the stable model ID." } }, { "@type": "Question", "name": "Can I call Gemini 3.1 Flash-Lite with the OpenAI SDK?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. Point the OpenAI SDK at https://runapi.ai/v1 with your RunAPI API key and send Chat Completions requests with model set to gemini-3.1-flash-lite. Tools use the standard OpenAI tools format." } }, { "@type": "Question", "name": "Can I send images or audio to gemini-3.1-flash-lite on RunAPI?", "acceptedAnswer": { "@type": "Answer", "text": "Not yet. Google's model reads images, video, audio, and PDFs, but RunAPI accepts text input only for gemini-3.1-flash-lite, and requests with media parts are rejected." } }, { "@type": "Question", "name": "How do I select gemini-3.1-flash-lite?", "acceptedAnswer": { "@type": "Answer", "text": "Pass the model ID shown in the quickstart." } }, { "@type": "Question", "name": "What's the rate limit on this variant?", "acceptedAnswer": { "@type": "Answer", "text": "Per-key rate limits scale with your usage tier. The pricing page shows current limits. If you need higher throughput, contact support to discuss tier upgrades." } }, { "@type": "Question", "name": "Can I switch variants later?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. Variant is a parameter in the request. Switch by changing the model ID — no code changes, no re-authentication, no separate billing setup. All variants share the same API key and request shape." } }, { "@type": "Question", "name": "Does it stream?", "acceptedAnswer": { "@type": "Answer", "text": "Where streaming is available, RunAPI streams end-to-end. LLM models support token-level streaming. Media models use async task polling or webhook callbacks for result delivery." } }, { "@type": "Question", "name": "Where do I report quality issues?", "acceptedAnswer": { "@type": "Answer", "text": "Open an issue on the public GitHub repo or email support at contact@runapi.ai. Include the task ID and model ID so the team can investigate the specific generation." } }, { "@type": "Question", "name": "Do I need a separate provider account?", "acceptedAnswer": { "@type": "Answer", "text": "No. Your RunAPI API key is enough to access this variant and every other model in the catalog. You do not need accounts with the underlying provider." } } ] } ] ```