GPT-5.1
GPT-5.1Alternatives?
CheaperGemini 3.8 Flashhighwins 58%-56%*$1.24Sampling parameters are ignored+1BetterGPT-6.1 Solmaxwins 54%+16%$0.72Remove unsupported parameters+5
OpenKimi K3maxwins 55%+75%$2.00Sampling parameters are fixed+3CheaperGemini 3.6 Flashhighwins 56%-56%*$1.60
CheaperMuse Sparkunstatedwins 55%-42%$1.25 / $4.25Only n=1 · Meta / Chat Completions+1Gemini 3.8 Flashhighwins 58%-56%*$1.24Sampling parameters are ignored+1Gemini 3.6 Flashhighwins 56%-56%*$1.60Muse Sparkunstatedwins 55%-42%$1.25 / $4.25Only n=1 · Meta / Chat Completions+1Muse Spark 1.3maxwins 55%-42%$1.60Only auto tool_choice is supported+5Gemini 3 Flash Previewunstatedwins 54%-67%$0.50 / $3GPT-6.1 Solmaxwins 54%+16%$0.72Remove unsupported parameters+5Muse Spark 1.2xhighwins 52%-42%$0.97Only auto tool_choice is supported+1GPT-5.6 Solxhighwins 56%+133%$1.18Gemini 3.8 Flashhighwins 58%-56%*$1.24Sampling parameters are ignored+1
GLM 5.2maxOpenwins 54%-37%$1.47No image inputKimi K3maxOpenwins 55%+75%$2.00Sampling parameters are fixed+3GLM 5.2maxOpenwins 54%-37%$1.47No image inputGLM 5.3maxOpenwins 53%-37%$2.01No image input+4GLM 5unstatedOpenwins 53%-55%$1 / $3.20Context: 400K → 203K+1GLM 5.1unstatedOpenwins 53%-37%$1.40 / $4.40Context: 400K → 203K+1GPT-5.6 Solxhighwins 56%—$1.18GPT-6.1 Solmaxwins 54%—$0.72Remove unsupported parameters+5GPT-5.5highwins 53%—$1.54Prompts with >272K input tokensGPT-6 Astramaxwins 53%—$3.26Monitoring can return HTTP 403+2GPT-5.4highsame—$2.50 / $15GPT-6 Solmaxsame—$1.04GPT-5.6 Terraxhighsame—$0.63Prompts with >272K input tokensGPT-6 Lunamaxwins 47%—$0.068Function calling only with none · Chat Completions+3All OpenAI models →History
17 versionsBenchmarks
in Writing & LanguageFAQ
How much does GPT-5.1 cost?›
$1.25 per 1M input tokens and $10 per 1M output tokens; cached input $0.13 per 1M.
Is GPT-5.1 free to use?›
There is no free API; the cheapest paid price is $1.25 per 1M input tokens.
How good is GPT-5.1, and what is it best at?›
#264 of 334 in Chat & Knowledge, #72 of 97 in Coding, #97 of 175 in Agents & Tool Use, #46 of 195 in Writing & Language, #89 of 124 in Vision & Documents.
Is GPT-5.1 better than GPT-5?›
On Arena Text · creative writing, GPT-5.1 scores 1,429 vs 1,372 — higher.
How can I use GPT-5.1?›
Through the API of Azure, OpenAI.
What is the context window of GPT-5.1?›
400K tokens, with up to 128K output tokens.
When was GPT-5.1 released? Is there a newer version?›
Released 2025-11-13. It has been superseded by GPT-6 Sol.
Is GPT-5.1 open source?›
No, GPT-5.1 is a closed model available through an API. The closest open-weights option here is Kimi K3.
Can GPT-5.1 read images?›
It accepts text and images, PDF files as input.
What is GPT-5.1?›
GPT-5.1 is a closed language model from OpenAI, released Nov 2025, the successor to GPT-5.
What are the best alternatives to GPT-5.1?›
Gemini 3.8 Flash (cheaper), GPT-6.1 Sol (better), Kimi K3 (open weights).