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GPT-6 Astra

Available
openai/gpt-6-astra

OpenAI's most capable GPT-6 model.

  • Chat
  • 1.05M context
  • 128K max output
  • Tools
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Pricing

Input
$10 / 1M tokens
Output
$50 / 1M tokens
Cached input
$1 / 1M tokens
Input, prompts over 272K
$20 / 1M tokens
Output, prompts over 272K
$75 / 1M tokens

Once a prompt reaches 272,001 tokens, the whole request is billed at the long-prompt rate.

What it costs

A typical request: 2,000 tokens in, 500 out$0.045
1,000 of those requests$45.00

Performance on SparrowCodes

Measured from real requests over the last 7 days.

No traffic yet. Speed, latency and success rate appear here once this model has served requests on SparrowCodes; we don't show estimates.

Official benchmarks

Scores published by the model's maker, under their test conditions.

  • Terminal-Bench 4.057.9%
  • FrontierCode 1.1 (Main)53.3%
  • GDPval-AA v2.11542 Elo
  • AutomationBench41.4%
  • Humanity's Last Exam · with tools57.2%
  • Terminal-Bench-Science 0.164.6%

Source: Anthropic: Claude Opus 5.5 announcement (as reported there) (2026-09-22)

Specifications

Type
Chat
Served by
OpenAI
Context window
1,050,000 tokens
Maximum output
128,000 tokens
Input types
Text
Tool calling
Supported

Use it

curl https://api.sparrowcodes.com/v1/chat/completions \
  -H "Authorization: Bearer $SPARROW_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/gpt-6-astra",
    "messages": [{"role": "user", "content": "Explain rate limiting in one paragraph."}]
  }'

Set "model" to openai/gpt-6-astra. The response includes its exact cost.

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