---
title: gpt-6-astra API — GPT Pricing & Specs | RunAPI
description: Use gpt-6-astra via RunAPI — the GPT family. Per-call pricing, model ID, specs, and developer setup guide.
url: https://runapi.ai/models/gpt/6-astra.md
canonical: https://runapi.ai/models/gpt/6-astra
locale: en
site: RunAPI
image: https://runapi.ai/assets/opengraph-f702f2b1.png
alternates:
  en: https://runapi.ai/models/gpt/6-astra
  zh-CN: https://runapi.ai/zh-CN/models/gpt/6-astra
  es: https://runapi.ai/es/models/gpt/6-astra
  ja: https://runapi.ai/ja/models/gpt/6-astra
  de: https://runapi.ai/de/models/gpt/6-astra
  fr: https://runapi.ai/fr/models/gpt/6-astra
  pt-BR: https://runapi.ai/pt-BR/models/gpt/6-astra
  ko: https://runapi.ai/ko/models/gpt/6-astra
  it: https://runapi.ai/it/models/gpt/6-astra
  nl: https://runapi.ai/nl/models/gpt/6-astra
  pl: https://runapi.ai/pl/models/gpt/6-astra
  tr: https://runapi.ai/tr/models/gpt/6-astra
  zh-TW: https://runapi.ai/zh-TW/models/gpt/6-astra
  zh-HK: https://runapi.ai/zh-HK/models/gpt/6-astra
  ar: https://runapi.ai/ar/models/gpt/6-astra
  x-default: https://runapi.ai/models/gpt/6-astra
model: GPT
provider: OpenAI
variant_id: gpt-6-astra
sdk_model_id: gpt-6-astra
modality: text
billing_unit: 1K tokens
status: active
---

> HTML version: https://runapi.ai/models/gpt/6-astra
> Site index for agents: https://runapi.ai/llms.txt


# gpt-6-astra API

Use gpt-6-astra from the GPT family via RunAPI. Per-call pricing, no subscription, and failed generations are never charged.

**OpenAI / [GPT](https://runapi.ai/models/gpt.md)**
**Operational · text · Commercial OK**

gpt-6-astra targets the sweet spot of quality and cost within the GPT family. It shares the same API key, request shape, and async task lifecycle as every other RunAPI model — switch to this variant by changing one model ID parameter. Install the GPT skill to load docs, typed schemas, pricing notes, and setup steps into your coding workspace. Billing is metered per completed request in USD with no subscription or minimum spend, and failed generations are never charged.

- Pay-per-call pricing in USD with no subscription
- Failed generations are never charged
- Streaming when supported by the model
- Schema-validated parameters and tool calls
- Switch variant by changing one model ID parameter
- Unified billing across all models and providers

## Pricing

### `chat_completion`

- Input: $5.00-$10.00 / 1M tokens
- Output: $25.00-$37.50 / 1M tokens
- Prompt < 272,001 · Input: $5.00 / 1M tokens
- Prompt < 272,001 · Cached input: $0.50 / 1M tokens
- Prompt < 272,001 · Cache write: $6.25 / 1M tokens
- Prompt < 272,001 · Output: $25.00 / 1M tokens
- Prompt >= 272,001 · Input: $10.00 / 1M tokens
- Prompt >= 272,001 · Cached input: $1.00 / 1M tokens
- Prompt >= 272,001 · Cache write: $12.50 / 1M tokens
- Prompt >= 272,001 · Output: $37.50 / 1M tokens

### `response`

- Input: $5.00-$10.00 / 1M tokens
- Output: $25.00-$37.50 / 1M tokens
- Prompt < 272,001 · Input: $5.00 / 1M tokens
- Prompt < 272,001 · Cached input: $0.50 / 1M tokens
- Prompt < 272,001 · Cache write: $6.25 / 1M tokens
- Prompt < 272,001 · Output: $25.00 / 1M tokens
- Prompt >= 272,001 · Input: $10.00 / 1M tokens
- Prompt >= 272,001 · Cached input: $1.00 / 1M tokens
- Prompt >= 272,001 · Cache write: $12.50 / 1M tokens
- Prompt >= 272,001 · Output: $37.50 / 1M tokens


Failed generations are not charged

## Technical details

| Field | Value |
|---|---|
| Model ID | `gpt-6-astra` |
| Provider | OpenAI |
| Modality | text |
| Task type | synchronous |
| Billing unit | 1K tokens |
| API endpoint | `/v1/chat/completions` |
|  | `/v1/responses` |
|  | `/v1/messages` |
|  | `/v1beta/models/gpt-6-astra:generateContent` |
|  | `/v1beta/models/gpt-6-astra:streamGenerateContent` |
| Commercial license | Yes — included via API |
| Catalog status | Operational |

**Request example**

```json
{
  "model": "gpt-6-astra",
  "messages": [
    {
      "role": "user",
      "content": "Analyze this quarterly revenue data and produce a summary with key trends, anomalies, and three recommendations."
    }
  ]
}
```

## Model skill — gpt-6-astra

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/gpt-6-astra:generateContent` | Gemini generateContent |
| `POST /v1beta/models/gpt-6-astra:streamGenerateContent` | Gemini streamGenerateContent |

Use the OpenAI or Anthropic SDK with your RunAPI API key and `model: "gpt-6-astra"`.

## Use gpt-6-astra with a model skill

1. **Install** — Install the model skill for the GPT line. The skill loads docs, typed schemas, pricing notes, and setup steps into your coding workspace so your agent has the right context.
2. **Configure** — Set the model field to the full model ID shown on this page and configure your RunAPI API key as an environment variable. The same key works across all models and providers.
3. **Call** — Use the skill instructions while adding prompt, input, and callback handling to your application. RunAPI routes the request to the provider, manages the async lifecycle, and returns structured JSON.
4. **Receive** — Read the task response by polling the task ID, streaming when supported, or handling the webhook callback at your configured URL. Generated outputs are stored and retrievable by task ID.

## What's different about gpt-6-astra

- **VS CODEX-AUTO-REVIEW: Most capable model: frontier reasoning, 1M context, code generation, and agentic tasks** — codex-auto-review
- **VS GPT-5.2: Most capable model: frontier reasoning, 1M context, code generation, and agentic tasks** — Professional knowledge work; Thinking mode for deep tasks
- **VS GPT-5.2-PRO: Most capable model: frontier reasoning, 1M context, code generation, and agentic tasks** — gpt-5.2-pro

## Best for

- **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 gpt-6-astra

### How do I select gpt-6-astra?

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 support@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.


### Other variants of GPT

- [codex-auto-review](https://runapi.ai/models/gpt/codex-auto-review.md) — `codex-auto-review` · Input $2.50 / 1M tokens | Output $15.00 / 1M tokens
- [gpt-5.2](https://runapi.ai/models/gpt/5.2.md) — `gpt-5.2` · Input $0.88 / 1M tokens | Output $7.00 / 1M tokens · Input $1.75 / 1M tokens | Output $14.00 / 1M tokens
- [gpt-5.2-pro](https://runapi.ai/models/gpt/5.2-pro.md) — `gpt-5.2-pro` · Input $10.50 / 1M tokens | Output $84.00 / 1M tokens
- [gpt-5.3-codex](https://runapi.ai/models/gpt/5.3-codex.md) — `gpt-5.3-codex` · Input $1.05 / 1M tokens | Output $8.40 / 1M tokens
- [gpt-5.3-codex-spark](https://runapi.ai/models/gpt/5.3-codex-spark.md) — `gpt-5.3-codex-spark` · Input $1.05 / 1M tokens | Output $8.40 / 1M tokens
- [gpt-5.4](https://runapi.ai/models/gpt/5.4.md) — `gpt-5.4` · Input $2.50 / 1M tokens | Output $15.00 / 1M tokens
- [gpt-5.4-mini](https://runapi.ai/models/gpt/5.4-mini.md) — `gpt-5.4-mini` · Input $0.45 / 1M tokens | Output $2.70 / 1M tokens
- [gpt-5.4-nano](https://runapi.ai/models/gpt/5.4-nano.md) — `gpt-5.4-nano` · Input $0.10 / 1M tokens | Output $0.63 / 1M tokens
- [gpt-5.4-pro](https://runapi.ai/models/gpt/5.4-pro.md) — `gpt-5.4-pro` · Input $30.00 / 1M tokens | Output $180.00 / 1M tokens
- [gpt-5.5](https://runapi.ai/models/gpt/5.5.md) — `gpt-5.5` · Input $5.00 / 1M tokens | Output $30.00 / 1M tokens
- [gpt-5.5-pro](https://runapi.ai/models/gpt/5.5-pro.md) — `gpt-5.5-pro` · Input $30.00 / 1M tokens | Output $180.00 / 1M tokens
- [gpt-5.6-luna](https://runapi.ai/models/gpt/5.6-luna.md) — `gpt-5.6-luna` · Input $0.20-$0.40 / 1M tokens | Output $1.20-$1.80 / 1M tokens
- [gpt-5.6-sol](https://runapi.ai/models/gpt/5.6-sol.md) — `gpt-5.6-sol` · Input $5.00 / 1M tokens | Output $30.00 / 1M tokens
- [gpt-5.6-terra](https://runapi.ai/models/gpt/5.6-terra.md) — `gpt-5.6-terra` · Input $2.00-$4.00 / 1M tokens | Output $12.00-$18.00 / 1M tokens

### Alternatives from other models

- [Claude](https://runapi.ai/models/claude.md) — Claude API access for Anthropic's LLM across complex reasoning, code, analysis, and extended-context tasks.
- [DeepSeek](https://runapi.ai/models/deepseek.md) — DeepSeek API access via RunAPI — flash for fast, low-cost work; pro for complex agentic tasks.
- [Embedding](https://runapi.ai/models/embedding.md) — OpenAI text embeddings for semantic search, retrieval, clustering, and ranking workflows.

## Start building with GPT.

- [Create free account](https://runapi.ai/login)
- [Read the quickstart →](https://runapi.ai/docs/api/openai/chat-completions)

---

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Contact: contact@runapi.ai

## Structured data

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