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OpenAI · Frontier

GPT 6 Sol

Added Sep 22, 2026

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Use in the app

GPT-6 Sol is the cost-efficient high-end model in OpenAI's GPT-6 series, positioned below the flagship GPT-6 Astra and above the fast GPT-6 Luna tier. It is suited for demanding professional work, reasoning, coding, and agentic workflows.

  • 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)
315 tokens
Longer than 34% of 473 models

Side by side

GPT 6 Sol compared

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

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GPT 6 SolOpenAIThis modelGemini 3.8 FlashGoogleRemove
ProviderOpenAIGoogle
Discovery tierFrontierEfficient
AddedSep 22, 2026Sep 2, 2026
Limits
Context window1.05MBest1.05M
Max output128KBest65.54K
Average output315 tokens1.2K tokens
Pricing, USD per 1M tokens
Input$2.00$0.75Best
Output$10.00$3.75Best
Cache read$0.20$0.075Best
Cache write$2.50$0.0417Best
Performance
Throughput—244.5 tok/s
Time to first token—8.5 s
Request success (24h)100.0%Best99.8%
Benchmark indexes
Intelligence Index39.839.8
Coding Index—74.1
Capabilities
ReasoningYesYes
ToolsYesYes
VisionYesYes
Structured outputYesYes
PDF inputYesYes
Audio inputNoYes
Video inputNoYes
Reasoning effortnone, low, medium, high, xhigh, maxminimal, low, medium, high

Public evaluations

Benchmarks

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

  • GPT 6 Sol
  • Gemini 3.8 Flash

Intelligence Index

  • GPT 6 Sol39.8
  • Gemini 3.8 Flash39.8

GPT 6 Sol tested at medium reasoning effort

GPT 6 Sol: Better than 84% of 326 scored models

3.8Catalog models by score55.1

Indexes

  • Coding Index

    Composite of the coding evaluations

    • GPT 6 Sol: —
    • Gemini 3.8 Flash: 74.1

Agentic work

  • AutomationBench-AA

    Workflow automation, penalized for guardrail violations

    • GPT 6 Sol: 58.0%
    • Gemini 3.8 Flash: 60.9%Top

  • AutomationBench-AA tasks completed

    Workflows finished end to end without a guardrail violation

    • GPT 6 Sol: 28.2%
    • Gemini 3.8 Flash: 31.1%Top

  • AA-Briefcasev1.1

    Agentic knowledge work, rated head to head

    • GPT 6 Sol: 1,148 Elo
    • Gemini 3.8 Flash: 1,181 EloTop

  • GDPval-AAv2.1

    Economically valuable occupational tasks, rated head to head

    • GPT 6 Sol: 1,346 Elo
    • Gemini 3.8 Flash: 1,423 EloTop

Document reasoning

  • GDP.pdf

    Professional reasoning over PDF documents, all-pass rate

    • GPT 6 Sol: 23.8%Top
    • Gemini 3.8 Flash: 22.8%

  • AA-LCRv1.1

    Reasoning across long documents

    • GPT 6 Sol: 82.3%
    • Gemini 3.8 Flash: 84.0%Top

  • MLCR-AA

    Long-context reasoning over medical records

    • GPT 6 Sol: 28.9%Top
    • Gemini 3.8 Flash: 12.8%

Reasoning and knowledge

  • Humanity’s Last Exam

    Expert-level questions across academic fields

    • GPT 6 Sol: 41.0%
    • Gemini 3.8 Flash: 42.1%Top

  • GPQA Diamond

    Graduate-level science questions

    • GPT 6 Sol: —
    • Gemini 3.8 Flash: 93.5%

Coding

  • Terminal-Benchv4.0

    Practical software engineering in a terminal

    • GPT 6 Sol: 18.7%
    • Gemini 3.8 Flash: 19.7%Top

  • SciCode

    Scientific computing in Python

    • GPT 6 Sol: 53.8%
    • Gemini 3.8 Flash: 55.1%Top

Legacy evaluations

  • AA-LCR (unversioned)

    Long-context reasoning, earlier grading

    • GPT 6 Sol: 82.3%
    • Gemini 3.8 Flash: 84.0%Top

Scores from Artificial Analysis, updated Oct 26, 2026. GPT 6 Sol was tested at medium 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.

Prompt cache hits
39.8%
About $1.28 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 85.7%
  • 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-sol",
    "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-sol",
    messages=[{"role": "user", "content": "Explain this stack trace."}],
)
print(reply.choices[0].message.content)

OpenAI

Other OpenAI models, starting with the same family.