GPT-5.1 Codex Mini
Nov 2025
Retired 2026-07-23Replace withGPT-5.6 TerraNewer version
MiMo v2.6 ProCheaper, as goodGPT-5.6 LunaBetter
GPT-5.6 TerraNewer versionMiMo v2.6 ProCheaper, as goodGPT-5.6 LunaBetterGPT-5.1 Codex MiniCompare inon
Benchmarks of GPT-5.1 Codex Mini16
BenchmarkByScoreRank
Overall1
Knowledge4
Science2
Coding3
Multimodal1
Documents1
Legacy · saturated or no longer reported4
No benchmark matches
Rankingat high effort?
Retired models are left out of the current rankings.
Alternatives?
ModelScoreCostPer taskWhat changes
CheaperMiMo v2.6 ProthinkingOpen×2.3-21%$0.13Pass back reasoning_content+3BetterGPT-5.6 Lunamedium+23%-35%$0.016
CheaperDeepSeek V4.1 Flash 1017maxOpen×2.2-24%$0.26Pass back reasoning_content · Chat Completions+4
CheaperClaude Haiku 5.5max×2.1-71%$0.21Remove sampling parameters+5
CheaperMiniMax M3.1 Flashthinking×2.1-62%$0.22Complete model response must be appendedModelScoreCostPer taskWhat changes
MiMo v2.6 ProthinkingOpen×2.3-21%$0.13Pass back reasoning_content+3DeepSeek V4.1 Flash 1017maxOpen×2.2-24%$0.26Pass back reasoning_content · Chat Completions+4Claude Haiku 5.5max×2.1-71%$0.21Remove sampling parameters+5MiniMax M3.1 Flashthinking×2.1-62%$0.22Complete model response must be appended
GLM 5.3 FlashmaxOpen×2.1-65%$0.28Defaults to max · Self-hosted+4ModelScoreCostPer taskWhat changes
GPT-5.6 Lunamedium+23%-35%$0.016GPT-6 Lunamedium+47%-71%$0.017Function calling only with none · Chat Completions+3Claude Haiku 5.5low+45%-71%$0.024Remove sampling parameters+5MiMo v2.5 ProthinkingOpen+28%-21%$0.054No image inputMiMo v2.6 FlashthinkingOpen+86%-75%$0.062Pass back reasoning_content+3ModelScoreCostPer taskWhat changes
MiMo v2.6 ProthinkingOpen×2.3-21%$0.13Pass back reasoning_content+3DeepSeek V4.1 Flash 1017maxOpen×2.2-24%$0.26Pass back reasoning_content · Chat Completions+4GLM 5.3maxOpen×2.2+213%$2.01No image input+4
Step 5 PreviewthinkingOpen×2.1+107%$1.03web_search not available · Chat Completions+2
Kimi K3maxOpen×2.1+773%$2.00Sampling parameters are fixed+3ModelScoreCostPer taskWhat changes
GPT-6 Astrahigh×2.5—$1.73Monitoring can return HTTP 403+2GPT-6.1 Solhigh×2.5—$0.32Remove unsupported parameters+5GPT-6 Solhigh×2.1—$0.37GPT-5.6 Solhigh×2.1—$0.81GPT-5.5high+81%—$1.54Prompts with >272K input tokensGPT-5.6 Terrahigh+68%—$0.34Prompts with >272K input tokensGPT-6 Lunahigh+62%—$0.029Function calling only with none · Chat Completions+3GPT-5.3 Codexxhigh+59%—$1.75 / $14DeprecatedAll OpenAI models →Benchmarks
all categoriesChat & Knowledge
AA Omniscience Index-16.4
GPQA Diamond81.3
Coding
Agents & Tool Use
τ²-bench · AA62.9
Writing & Language
Vision & Documents
FAQ
How much does GPT-5.1 Codex Mini cost?›
$0.25 per 1M input tokens and $2 per 1M output tokens (cheapest host: Azure).
Is GPT-5.1 Codex Mini free to use?›
There is no free API; the cheapest paid price is $0.25 per 1M input tokens.
How can I use GPT-5.1 Codex Mini?›
Through the API of Azure.
What is the context window of GPT-5.1 Codex Mini?›
400K tokens, with up to 128K output tokens.
When was GPT-5.1 Codex Mini released? Is there a newer version?›
Released 2025-11-13. It has been superseded by GPT-5.6 Terra.
Is GPT-5.1 Codex Mini open source?›
No, GPT-5.1 Codex Mini is a closed model available through an API. The closest open-weights option here is MiMo v2.6 Pro.
Can GPT-5.1 Codex Mini read images?›
It accepts text and images as input.
What is GPT-5.1 Codex Mini?›
GPT-5.1 Codex Mini is a closed language model from OpenAI, released Nov 2025.
What are the best alternatives to GPT-5.1 Codex Mini?›
MiMo v2.6 Pro (cheaper), GPT-5.6 Luna (better).