GPT-6.1 Sol

Sep 2026
GPT-6.1 Sol
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$0.32per task?
$2 / $10per 1M in / outcache $0.10
50 tok/sfirst token in 50 s?
1.05Mcontext

Rankingat high effort?

Alternatives?

History

3 versions
485052Oct 26Release dateHumanity's Last Exam5.666.1
485052Oct 26Release dateHumanity's Last Exam5.666.1

Benchmarks

all categories
Chat & Knowledge
HealthBench Professional length-adjustedlab64.2
HealthBench length-adjustedlab58.5
HealthBench Hard length-adjustedlab36.2
HealthBench Consensus length-adjustedlab96
Coding
SciCode55.8#26
DeepSWE 1.1lab64.4
COBOL migration evallab86.6
MultiLangBenchlab67.5
Agents & Tool Use
Vision & Documents

Watch out 6

Remove unsupported parameters›

With reasoning enabled, remove temperature, top_p and top_logprobs, plus Chat Completions logprobs or Responses message.output_text.logprobs includes. Source ↗

Responses API for tool calling · Chat Completions›

Use Responses for tools; Chat Completions supports this model without tool calling. Source ↗

No none or minimal reasoning›

The none and minimal reasoning efforts are unsupported; choose low, medium, high, xhigh or max. Source ↗

More than 272K input tokens›

Prompts above 272K input tokens charge 2× input and cache rates and 1.5× output rates for the entire request. Source ↗

Cache writes billed at 1.25x›

Cache writes cost 1.25× the uncached input token rate. Source ↗

Ultrafast prices 6x Standard›

Ultrafast mode costs 6× Standard token prices. Source ↗

FAQ

How much does GPT-6.1 Sol cost?›

$2 per 1M input tokens and $10 per 1M output tokens; cached input $0.10 per 1M. A typical benchmark task costs about $0.32 at high effort.

Is GPT-6.1 Sol free to use?›

There is no free API; the cheapest paid price is $2 per 1M input tokens.

How good is GPT-6.1 Sol, and what is it best at?›

#9 of 334 in Chat & Knowledge, #8 of 132 in Coding, #11 of 133 in Agents & Tool Use, #19 of 195 in Writing & Language, #4 of 124 in Vision & Documents. Strongest at: Coding, Agents & work tasks, Reasoning, Long context, Knowledge, Vision.

Is GPT-6.1 Sol better than GPT-6 Sol?›

On Humanity's Last Exam, GPT-6.1 Sol scores 52.9 vs 47.9 — higher. It is 69% cheaper per task.

How can I use GPT-6.1 Sol?›

Through the API of Amazon Bedrock, Azure, OpenAI.

What is the context window of GPT-6.1 Sol?›

1.05M tokens, with up to 128K output tokens.

When was GPT-6.1 Sol released? Is there a newer version?›

Released 2026-09-29. It is the current version in its line.

Is GPT-6.1 Sol open source?›

No, GPT-6.1 Sol is a closed model available through an API. The closest open-weights option here is MiMo v2.6 Pro.

Can GPT-6.1 Sol read images?›

It accepts text and images, PDF files as input.

What is GPT-6.1 Sol?›

GPT-6.1 Sol is a closed language model from OpenAI, released Sep 2026, the successor to GPT-6 Sol.

What are the best alternatives to GPT-6.1 Sol?›

MiMo v2.6 Pro (cheaper), Claude Opus 5.5 (better).