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OpenAI · Frontier

GPT 6 Astra Pro

Added Sep 4, 2026

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Use in the app

GPT 6 Astra in Pro reasoning mode. Uses additional model work for difficult tasks, with higher latency and token usage at the same per-token rates. Reasoning effort remains independently configurable.

  • Reasoning
  • Tools
  • Vision
  • Structured output
  • PDF input
Input
Text, Images
Output
Text
Reasoning effort
low · medium · high · xhigh · max
Discovery tier
Frontier

Pricing

USD per 1M tokens
Input
$10.00
Output
$50.00
Cache read
$1.00
Cache write
$12.50

Reference prices as published by the model provider. API example

Specifications

Context window
1.1M
Max output
128K
Average output (7 days)
1.4K tokens
Longer than 84% of 465 models

Side by side

GPT 6 Astra Pro compared

Specifications, prices, speed and benchmark scores next to each other. Benchmarks below show every compared model too.

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GPT 6 Astra ProOpenAIThis modelClaude Fable 5.1AnthropicRemove
ProviderOpenAIAnthropic
Discovery tierFrontierFrontier
AddedSep 4, 2026Sep 1, 2026
Limits
Context window1.05MBest1M
Max output128K128K
Average output1.4K tokens2.3K tokens
Pricing, USD per 1M tokens
Input$10.00$10.00
Output$50.00$50.00
Cache read$1.00$0.25Best
Cache write$12.50$12.50
Performance
Throughput—136.6 tok/s
Time to first token—6.4 s
Request success (24h)100.0%Best99.1%
Benchmark indexes
Intelligence Index—53.4
Coding Index—81.6
Capabilities
ReasoningYesYes
ToolsYesYes
VisionYesYes
Structured outputYesYes
PDF inputYesYes
Reasoning effortlow, medium, high, xhigh, maxlow, medium, high, xhigh, max

Public evaluations

Benchmarks

Independent evaluation results, with how each score ranks among the models in the Noumen catalog.

  • GPT 6 Astra Pro
  • Claude Fable 5.1

Intelligence Index

  • GPT 6 Astra Pro—
  • Claude Fable 5.153.4
3.8Catalog models by score55.1

Indexes

  • Coding Index

    Composite of the coding evaluations

    • GPT 6 Astra Pro: —
    • Claude Fable 5.1: 81.6

Agentic work

  • AutomationBench-AA

    Workflow automation, penalized for guardrail violations

    • GPT 6 Astra Pro: —
    • Claude Fable 5.1: 59.4%

  • AutomationBench-AA tasks completed

    Workflows finished end to end without a guardrail violation

    • GPT 6 Astra Pro: —
    • Claude Fable 5.1: 32.1%

  • Harvey LAB-AAv1.1

    Legal tasks passed in full, with no material hallucination

    • GPT 6 Astra Pro: —
    • Claude Fable 5.1: 6.4%

  • AA-Briefcasev1.1

    Agentic knowledge work, rated head to head

    • GPT 6 Astra Pro: —
    • Claude Fable 5.1: 1,671 Elo

  • GDPval-AAv2.1

    Economically valuable occupational tasks, rated head to head

    • GPT 6 Astra Pro: —
    • Claude Fable 5.1: 1,755 Elo

Document reasoning

  • GDP.pdf

    Professional reasoning over PDF documents, all-pass rate

    • GPT 6 Astra Pro: —
    • Claude Fable 5.1: 26.2%

  • AA-LCRv1.1

    Reasoning across long documents

    • GPT 6 Astra Pro: —
    • Claude Fable 5.1: 85.3%

  • MLCR-AA

    Long-context reasoning over medical records

    • GPT 6 Astra Pro: —
    • Claude Fable 5.1: 15.6%

Reasoning and knowledge

  • Humanity’s Last Exam

    Expert-level questions across academic fields

    • GPT 6 Astra Pro: —
    • Claude Fable 5.1: 59.1%

  • GPQA Diamond

    Graduate-level science questions

    • GPT 6 Astra Pro: —
    • Claude Fable 5.1: 93.7%

Coding

  • Terminal-Benchv4.0

    Practical software engineering in a terminal

    • GPT 6 Astra Pro: —
    • Claude Fable 5.1: 52.0%

  • SciCode

    Scientific computing in Python

    • GPT 6 Astra Pro: —
    • Claude Fable 5.1: 63.1%

Legacy evaluations

  • AA-LCR (unversioned)

    Long-context reasoning, earlier grading

    • GPT 6 Astra Pro: —
    • Claude Fable 5.1: 85.3%

Scores from Artificial Analysis, updated Oct 26, 2026. Artificial Analysis

Live routing data

Performance and reliability

Recent averages across requests routed for this model. Your own speed depends on prompt length, reasoning effort and load.

Prompt cache hits
31.5%
About $7.17 per 1M input tokens with caching
Request success (24h)
100.0%
Reliable

Cache hits are the share of input tokens recently served from a prompt cache across all requests. They are not a forecast of your own hit rate.

Hourly request success · last 72 hoursLowest hour 100.0%
  • Healthy (98% or more)
  • Degraded (90–98%)
  • Down (under 90%)
  • No requests

Developers

Use it through the API

Noumen’s API is OpenAI-compatible: any Chat Completions client works with a base URL and a key.

Read the quickstart
curl https://www.noumen.xyz/api/v1/chat/completions \
  -H "Authorization: Bearer $NOUMEN_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/gpt-6-astra-pro",
    "reasoning_effort": "medium",
    "messages": [{ "role": "user", "content": "Explain this stack trace." }]
  }'
import os
from openai import OpenAI

client = OpenAI(base_url="https://www.noumen.xyz/api/v1", api_key=os.environ["NOUMEN_API_KEY"])
reply = client.chat.completions.create(
    model="openai/gpt-6-astra-pro",
    messages=[{"role": "user", "content": "Explain this stack trace."}],
)
print(reply.choices[0].message.content)

OpenAI

Other OpenAI models, starting with the same family.