GPT-6 Astra

Text & chatNewAvailable
by OpenAIModel ID: gpt-6-astra

OpenAI's most capable model, built for the hardest end-to-end work. Reasoning, text and image input, function calling and tool use, 1,050,000-token context window and up to 128,000 output tokens. Knowledge cutoff April 30, 2026.

Price · 1M in / out
$12.00 / $60.00
Context
1,050,000 tokens
Max. output
128,000 tokens
Input → output
Text → Text
Developer
OpenAI
Updated
September 24, 2026
01

Playground

Try GPT-6 Astra

Chat

$12.00/1M in
Try GPT-6 Astra

Send a message. The answer arrives in full once the model is done (no streaming).

System prompt
Max. answer length (tokens)

This run

at most $0.0615 · 6.15 credits reserved

Billed by the tokens actually used; the unused part of the reservation is refunded.

For accounts without a purchase: runs above 2 credits need a top-up.

New here?

10 free credits ($0.10) when you sign up with Google

Usable 24 hours after sign-up, up to 5 runs per day and at most 2 credits per run. Other sign-in methods start without credits.

02

About GPT-6 Astra

TL;DRAs of September 24, 2026

GPT-6 Astra is a model by OpenAI in the Text & chat category. On Railwail, GPT-6 Astra costs $12.00 per 1M input tokens and $60.00 per 1M output tokens. The context window holds 1,050,000 tokens, and one response can be up to 128,000 tokens long.

03

Pricing

Prices in US dollars. Usage is charged from prepaid credits.
Input$12.00 / 1M tokens
Output$60.00 / 1M tokens
Input (prompts over 272,000 tokens)$24.00 / 1M tokens
Output (prompts over 272,000 tokens)$90.00 / 1M tokens
  • Billed by the tokens each request actually uses.
  • 1 credit = $0.01

Cost calculator

Price calculator

/ req.
/ req.

Total

$4.20

420 credits

Per request

$0.042 · 4.2 credits

Each request is rounded up to 0.01 credits.

04

API

Call GPT-6 Astra with your Railwail API key. Use this model ID in the request:
curl https://railwail.com/api/v1/chat/completions \
  -H "Authorization: Bearer $RAILWAIL_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-6-astra",
    "messages": [
      {
        "role": "user",
        "content": "Explain what a vector database is in two sentences."
      }
    ],
    "max_tokens": 1024
  }'
Set your key as RAILWAIL_API_KEYCreate API key
05

Specifications

Model ID
gpt-6-astra
Developer
OpenAI
Category
Text & chat
Input
Text
Output
Text
Context window
1,050,000 tokens
Max. output
128,000 tokens
Billing
By usage (tokens or GPU time)
Catalog entry updated
September 24, 2026

Tags

  • openai
  • gpt-6
  • flagship
  • reasoning
  • vision
  • tools
06

Use cases

07

Frequently asked questions

What is GPT-6 Astra?

GPT-6 Astra is a model by OpenAI in the Text & chat category. On Railwail you can call it with an API key through the Railwail API.

How much does GPT-6 Astra cost on Railwail?

On Railwail, GPT-6 Astra costs $12.00 per 1M input tokens and $60.00 per 1M output tokens. You are charged for what each request actually uses. Usage is paid from prepaid credits; 1 credit equals $0.01.

What is the context window of GPT-6 Astra?

The context window of GPT-6 Astra holds 1,050,000 tokens. One response can be up to 128,000 tokens long.

How fast is GPT-6 Astra?

There are not enough measured runs of GPT-6 Astra on Railwail yet to state a run time. It depends on the input, the settings and the load at the provider.

Is GPT-6 Astra better than Claude Fable 5.1?

That depends on the task. GPT-6 Astra (OpenAI) and Claude Fable 5.1 (Anthropic) are both models in the Text & chat category. The comparison page shows their prices and specifications side by side.

Compare GPT-6 Astra and Claude Fable 5.1

How do I use GPT-6 Astra through the API?

Create a Railwail API key and send your request with the model ID gpt-6-astra. Code examples for curl, Python and JavaScript are in the API section of this page.

08

Comparable models

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Use GPT-6 Astra via the API

One API key for every model on Railwail. Usage is charged from prepaid credits, 1 credit = $0.01.