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OpenAI · Frontier

GPT 5.6 Sol Pro

Added Jul 9, 2026

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Use in the app

GPT-5.6 Sol with Pro reasoning mode. Pro mode performs more model work for difficult tasks; reasoning effort remains independently configurable and defaults to medium.

  • Reasoning
  • Tools
  • Vision
  • Structured output
  • PDF input
Input
Text, Images
Output
Text
Reasoning effort
none · low · medium · high · xhigh · max
Discovery tier
Frontier

Pricing

USD per 1M tokens
Input
$2.00
Output
$10.00
Cache read
$0.20
Cache write
$2.50

Reference prices as published by the model provider. API example

Specifications

Context window
1.1M
Max output
128K
Average output (7 days)
4.7K tokens
Longer than 98% of 473 models

Side by side

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TryClaude Sonnet 5.5Grok 4.7MiMo V2.6 ProAll 3

Public evaluations

Benchmarks

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

Intelligence Index

47.0

Tested at max reasoning effort

Better than 94% of 326 scored models

3.8Catalog models by score55.1

Indexes

  • Coding Index

    77.4

    Composite of the coding evaluations

    Better than 97% of 168 scored models

Agentic work

  • AutomationBench-AA

    60.1%

    Workflow automation, penalized for guardrail violations

    Better than 82% of 173 scored models

  • AutomationBench-AA tasks completed

    30.3%

    Workflows finished end to end without a guardrail violation

    Better than 86% of 173 scored models

  • AA-Briefcasev1.1

    1,479 Elo

    Agentic knowledge work, rated head to head

    Better than 80% of 166 scored models

  • GDPval-AAv2.1

    1,609 Elo

    Economically valuable occupational tasks, rated head to head

    Better than 85% of 187 scored models

Document reasoning

  • GDP.pdf

    27.2%

    Professional reasoning over PDF documents, all-pass rate

    Better than 92% of 171 scored models

  • AA-LCRv1.1

    84.0%

    Reasoning across long documents

    Better than 94% of 309 scored models

  • MLCR-AA

    30.0%

    Long-context reasoning over medical records

    Better than 92% of 121 scored models

Reasoning and knowledge

  • Humanity’s Last Exam

    49.5%

    Expert-level questions across academic fields

    Better than 94% of 323 scored models

  • GPQA Diamond

    94.1%

    Graduate-level science questions

    Better than 96% of 291 scored models

  • IFBench

    72.7%

    Following precise output instructions

    Better than 80% of 215 scored models

Coding

  • Terminal-Benchv4.0

    39.9%

    Practical software engineering in a terminal

    Better than 85% of 171 scored models

  • SciCode

    57.1%

    Scientific computing in Python

    Better than 80% of 174 scored models

Legacy evaluations

  • Terminal-Bench Hard

    65.9%

    Earlier terminal task suite

    Better than 99% of 212 scored models

  • τ²-Bench Telecom

    85.1%

    Tool use in a customer-support simulation

    Better than 67% of 214 scored models

  • AA-LCR (unversioned)

    84.0%

    Long-context reasoning, earlier grading

    Better than 94% of 309 scored models

Scores from Artificial Analysis, updated Oct 26, 2026. GPT 5.6 Sol Pro was tested at max reasoning effort; compare scores measured at the same effort.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.

Throughput
574.6 tok/s
Faster than 98% of 257 models
Time to first token
26.8 s
Quicker than 0% of 257 models
Prompt cache hits
46.6%
About $1.16 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-5.6-sol-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-5.6-sol-pro",
    messages=[{"role": "user", "content": "Explain this stack trace."}],
)
print(reply.choices[0].message.content)

OpenAI

Other OpenAI models, starting with the same family.