GPT-6.1 Sol changelog

Vals Index: Sonnet 5.5 edges Opus 5.5 and Gemini 4 Argon

Vals AI's GDP-weighted index of finance, coding, legal and tax tasks ranks Claude Sonnet 5.5 first at 70.85%, Opus 5.5 at 70.18%, Gemini 4 Argon 69.24%, GPT-6 Astra 65.02% and GPT-6.1 Sol 63.94% as of October 21, 2026.

Arena text leaderboard: Gemini 4 Argon first, Opus 5.5 second, GPT-6 Astra 73rd

Arena's October 20, 2026 text leaderboard ranks Gemini 4 Argon (High) first at 1532 (4,900 votes), Claude Opus 5.5 (High) second at 1516, Claude Opus 5 (Max) fourth at 1509, Claude Sonnet 5.5 (xHigh) 28th at 1473, GPT-6.1 Sol (Max) 66th at 1443 and GPT-6 Astra (Max) 73rd at 1441.

Arena WebDev leaderboard: Opus 5.5 first, GPT-6 Astra second

Arena's October 19, 2026 WebDev leaderboard ranks Claude Opus 5.5 (Max) first at 1807 (2,925 votes), GPT-6 Astra (Max) second at 1774, Claude Sonnet 5.5 (xHigh) third at 1768, GPT-6.1 Sol (Max) fourth at 1753, Claude Opus 5 (Max) eighth at 1689 and Gemini 4 Argon (High) tenth at 1678.

Vals AI Terminal-Bench 4.0 with one harness: Opus 5.5 65.2%, Astra 59.6%, Argon 57.6%

Running every model in the same Mini-SWE-agent harness, Vals AI reports Claude Opus 5.5 at 65.15%, Sonnet 5.5 64.14%, GPT-6 Astra 59.60%, Gemini 4 Argon 57.58%, GPT-6.1 Sol 55.05% and Opus 5 53.53%. GPT-6.1 Sol cost $1.72 per test against $13.20 for Opus 5.5.

SlopCodeBench: GPT-6 Astra leads strict pass rate, Opus 5.5 does better at medium than xhigh

On 36 problems and 196 checkpoints, GPT-6 Astra at xhigh had the best strict pass rate (16.33%), GPT-6.1 Sol medium 14.80% and Opus 5.5 medium 14.29%. Opus 5.5 at xhigh scored lower (12.76%) at 4.22 times the cost. The Hacker News thread drew 303 points and 120 comments.

Who is affected:

Teams choosing effort levels for long coding tasks with changing requirements.

What to do:

Test medium effort before paying for xhigh.

GPT-6.1 Sol Ultrafast mode arrives in the API and Codex at six times the price

Ultrafast mode for GPT-6.1 Sol is available to all API users in the Responses API, and in Codex and ChatGPT Work on Pro $500 and eligible Enterprise and Edu plans, where admins must turn it on. It costs $12 per million input tokens and $60 per million output tokens, six times the Standard price.

GPT-6.1 Sol in Codex matches Astra at 58.2% on Terminal-Bench 4.0 for about a fifth of the cost

Codex with GPT-6.1 Sol at max effort resolved 58.18% (plus or minus 3.1, 330 trials) for $634.24 total, against $3,267.18 for GPT-6 Astra at the same score. Posted October 6, 2026.

Who is affected:

Codex users deciding between GPT-6.1 Sol and GPT-6 Astra.

What to do:

Try GPT-6.1 Sol first for terminal tasks.

GPT-6.1 Sol available in Perplexity and powers Light effort in Computer

GPT-6.1 Sol became available to eligible paid subscribers in Perplexity and Computer, and it powers Light effort in Computer.

Epoch: GPT-6.1 Sol matches GPT-6 Astra on FrontierMath tiers 1-3

Epoch's data records gpt-6.1-sol at max effort scoring 0.937 on FrontierMath tiers 1-3 (the same as GPT-6 Astra at max), 1.0 on FrontierMath tier 4 v2 and 0.954 on GPQA Diamond, from runs started September 29, 2026.

GPT-6.1 Sol available in GitHub Copilot

GPT-6.1 Sol is available on Copilot Pro+, Max, Business and Enterprise at provider list price.

GPT-6.1 Sol becomes the default model in the Codex CLI catalog

Codex CLI 0.159.1 added GPT-6.1 Sol as the default model in the bundled catalog and the Amazon Bedrock Mantle and Runtime catalogs.

Who is affected:

Codex CLI users who have not pinned a model.

What to do:

Pin a model in your Codex config if you need the previous default.

GPT-6.1 Sol arrives in Codex and ChatGPT Work

GPT-6.1 Sol rolled out to Codex and ChatGPT Work for Plus, Pro, Business, Enterprise and Edu. Free and Go were not included at launch.

Who is affected:

Codex and ChatGPT Work users.

What to do:

Try gpt-6.1-sol for long-running work.

GPT-6.1 Sol released

GPT-6.1 Sol launched for complex coding and professional work at $2 input, $0.10 cached input, $2.50 cache write and $10 output per million tokens, with multi-agent support in beta.

Who is affected:

Developers on GPT-6 Sol or GPT-6 Astra.

What to do:

Evaluate GPT-6.1 Sol as a cheaper alternative to Astra.

OpenAI plans to end Cursor's access to its models on November 12, 2026

After SpaceX's acquisition of Cursor, OpenAI announced it is winding down its contract supplying models to Cursor with a proposed November 12 cutoff. Cursor's CEO said OpenAI models serve about 5% of Cursor traffic. Cursor's model docs list no GPT-6 models. The Hacker News thread drew 852 points and 544 comments.

Takes effect Nov 12, 2026 · in 11 days

Who is affected:

Cursor users who rely on OpenAI models.

Action needed:

Move Cursor workflows off OpenAI models before November 12, 2026, or use Codex or another tool for them.