GPT-6 Astra API

OpenAI GPT-6 Astra: the most capable GPT-6 tier for hard reasoning, coding and agents. 1.05M context.

OpenAI·ChatAvailable

from$2.52/ 1M input tokens$2.810% off

Model IDgpt-6-astra

reasoningtools1m-context

Input

Text

Output

Chat

Provider

7 providers

Last 7 days · not enough recent requests for stats yet.

GPT-6 Astra pricing

Prices are per unit; requests without a provider are routed to the cheapest provider that supports your parameters.

OptionPrice (USD)
All options
$12.6 / 1M output tokens
1260 Credits$1410% off

Try GPT-6 Astra before you integrate

Test output quality, compare provider prices and estimate cost before writing any code.

Provider
Chat

Settings

PriceKIE AI
1M input tokens$2.52
1M output tokens$12.6

Credits for max_tokens are held first, then settled to the actual usage.

GPT-6 AstraAuto (cheapest)
GPT-6 Astra

Start a conversation. Replies stream in and are billed by actual token usage.

Enter to send · Shift + Enter for a new line

GPT-6 Astra prompt examples

Ready-to-use prompts. Load one into the playground and tweak it.

Source
Scene

19 prompts

Review this diff and list only the blocking issues. For each one give the file, the line and a one-sentence fix. <paste diff here>

Write a two-page brief on the home battery storage market in Europe: key players, pricing trends, regulation and the three biggest risks for a new entrant. End with a recommendation.

I need to migrate 40 microservices from REST to gRPC with zero downtime. Produce a phased plan with milestones, rollback points and the checks an automated agent should run after each phase.

GPT-6 Astra API reference

Endpoints, request fields and runnable examples for this model.

Base URL

https://01router.com/api/v1
llms.txt

Quick start

Set API_KEY to your project key, then run a sample from your server. Replace example media URLs with your own public URLs.

Auto-routing chooses a provider that supports the request. Select a provider to see its input constraints and pinned request examples.

curl https://01router.com/api/v1/chat/completions \
  -H "Authorization: Bearer $API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-6-astra",
    "messages": [{ "role": "user", "content": "Hello!" }],
    "stream": false
  }'

Endpoints

Only endpoints relevant to this model are listed. Paths below include /api/v1. Click an endpoint to read its usage.

Authentication

Send your API key as a Bearer token. Requests are billed to the key owner's credits.

Authorization: Bearer YOUR_API_KEY
Content-Type: application/json
Get an API key

Input

Send messages directly in the request body. Chat requests do not use an input wrapper.

Request body

NameTypeRequiredDescription
modelstringYes"gpt-6-astra"
providerstringNoPin a provider; omit to auto-route to the cheapest. One of: wavespeed | kie | apimart | evolink | atlascloud | vercel | openrouter
messagesobject[]YesOpenAI-format messages, each with role and content.
streambooleanNotrue returns an SSE stream.
max_tokensintegerNoOutput token cap; credits are pre-held for it (default 4096).

Output

This example uses stream: false. Read the reply from choices[0].message.content. With stream: true, read SSE chunks from choices[].delta until [DONE].

Task completed

{
  "id": "chatcmpl-example",
  "object": "chat.completion",
  "model": "gpt-6-astra",
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "assistant",
        "content": "Hello! How can I help?"
      },
      "finish_reason": "stop"
    }
  ],
  "usage": {
    "prompt_tokens": 9,
    "completion_tokens": 8,
    "total_tokens": 17
  }
}

Response fields

NameTypeRequiredDescription
idstringYesChat completion ID
objectstringYeschat.completion
modelstringYesgpt-6-astra
choicesobject[]YesReply choices; message.content contains the non-streaming response.
usageobjectNoToken usage: prompt_tokens, completion_tokens and total_tokens. Availability depends on the provider.

Model schema

This public endpoint returns the model parameters and each provider’s supported constraints and prices.

curl "https://01router.com/api/v1/models/gpt-6-astra"

Errors

Check the HTTP status and error.message. Fix the request before retrying validation or authentication errors. A failed generation is reported in status and error on the task itself.

{
  "error": {
    "message": "Invalid or missing API key",
    "code": "unauthorized"
  }
}

400Invalid body or parameter value

401Missing or invalid API key

402Not enough credits

404Unknown model or generation

429Too many requests — retry after the given seconds

502Every provider rejected the task (credits refunded)

Auth, routing, billing and error codes are covered in →

Use with AI

Give your coding assistant this model reference: endpoints, input constraints, output fields and request examples in plain text.

Open llms.txt

How does GPT-6 Astra compare?

Specs and starting prices side by side. Test with the same prompt before you choose.

GPT-6 AstraGPT-6 SolGPT-6 LunaGPT-5.6 Sol
VendorOpenAIOpenAIOpenAIOpenAI
Starting price$2.52 / 1M input tokens$0.54 / 1M input tokens$0.027 / 1M input tokens$1.26 / 1M input tokens
InputTextTextTextText
Provider7 providers7 providers8 providers8 providers

GPT-6 Astra API FAQ

What is GPT-6 Astra best at?

Astra is the most capable GPT-6 tier, aimed at the hardest end-to-end work: complex reasoning, agentic coding, computer use, deep research and long document creation. Route lighter or latency-sensitive traffic to GPT-6 Sol or Luna.

What are the context window and output limits?

About 1.05M tokens of context with up to 128K output tokens per response. Very long prompts (above roughly 272K tokens) are billed at a higher long-context rate by the upstream provider.

Which reasoning effort levels are available?

Astra supports low, medium, high, xhigh and max. Higher effort improves hard problems but uses more output tokens, which are billed at the output rate.

Does it support images, tools and streaming?

Yes. It accepts text and image input, supports function calling and JSON structured output, and can stream responses over SSE through our OpenAI-compatible /chat/completions endpoint.

How is GPT-6 Astra billed on 01router?

Per 1M input and output tokens, using the usage returned by the provider. Credits are reserved from max_tokens and settled to actual usage when the response finishes. See the pricing table for each provider's rate.

Related models

Other models you can call with the same API key.