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Model Timeline

Timeline of GPT-5.1-Codex

Every recorded change for this model by OpenAI, newest first. Back to the entity page →

10 events

Year

All years 2026

Category · events in the last 365 days

All categories Benchmarks4,947 Models2,231 Companies1,599 Research1,104 Releases1,019 Providers & pricing640 Datasets146 Frameworks136 Hardware43 Repositories10 Pricing2

Filtered to one entity. Show the whole atlas

Sept 202610

Sept 2026 10

11 Sept 2026
Benchmark resultModelGPT-5.1-CodexOpenAI
GPT-5.1-Codex scores 66% on SWE-bench Verified
swebench_leaderboard
swebench.com

11 Sept 2026

Benchmark resultModelGPT-5.1-CodexOpenAI

GPT-5.1-Codex scores 34.85% on Terminal-Bench

artificial_analysis

artificialanalysis.ai

11 Sept 2026

Benchmark resultModelGPT-5.1-CodexOpenAI

GPT-5.1-Codex scores 83.04% on τ²-bench

artificial_analysis

artificialanalysis.ai

11 Sept 2026

Benchmark resultModelGPT-5.1-CodexOpenAI

GPT-5.1-Codex scores 72.49% on MMMU-Pro

artificial_analysis

artificialanalysis.ai

11 Sept 2026

Benchmark resultModelGPT-5.1-CodexOpenAI

GPT-5.1-Codex scores 70% on IFBench

artificial_analysis

artificialanalysis.ai

11 Sept 2026

Benchmark resultModelGPT-5.1-CodexOpenAI

GPT-5.1-Codex scores 25.72% on Humanity's Last Exam

artificial_analysis

artificialanalysis.ai

11 Sept 2026

Benchmark resultModelGPT-5.1-CodexOpenAI

GPT-5.1-Codex scores 85.96% on GPQA

artificial_analysis

artificialanalysis.ai

11 Sept 2026

Benchmark resultModelGPT-5.1-CodexOpenAI

GPT-5.1-Codex scores 23.7 on Artificial Analysis Intelligence Index

artificial_analysis

artificialanalysis.ai

11 Sept 2026

Listed by providerModelGPT-5.1-CodexOpenAI

OpenAI API lists GPT-5.1-Codex at $1.25 in / $10 out per 1M tokens

openrouter

openrouter.ai

11 Sept 2026

New modelModelGPT-5.1-CodexOpenAI

New model: GPT-5.1-Codex (OpenAI)

openai

developers.openai.com

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