o3
o3Alternatives?
CheaperMuse Spark 1.3maxwins 63%-43%$3.69Only auto tool_choice is supported+5BetterGPT-5.6 Lunaxhighwins 55%-87%$0.085
OpenKimi K3maxwins 60%+71%$2.00Sampling parameters are fixed+3
CheaperGemini 3.8 Flashhighwins 63%-57%*$3.49Sampling parameters are ignored+1CheaperMuse Sparkunstatedwins 61%-43%$1.25 / $4.25Only n=1 · Meta / Chat Completions+1Muse Spark 1.3maxwins 63%-43%$3.69Only auto tool_choice is supported+5Gemini 3.8 Flashhighwins 63%-57%*$3.49Sampling parameters are ignored+1Muse Sparkunstatedwins 61%-43%$1.25 / $4.25Only n=1 · Meta / Chat Completions+1Gemini 3 Flash Previewunstatedwins 61%-68%$0.50 / $3
GLM 5.3maxOpenwins 59%-39%$2.01No image input+4GPT-5.6 Lunaxhighwins 55%-87%$0.085GPT-5.6 Terraxhighwins 56%+29%$0.63Prompts with >272K input tokensGPT-5.6 Solxhighwins 58%+129%$1.18GLM 5.2maxOpenwins 57%-39%$1.28No image inputGPT-5.5highwins 56%+221%$1.40Prompts with >272K input tokensKimi K3maxOpenwins 60%+71%$2.00Sampling parameters are fixed+3GLM 5.3maxOpenwins 59%-39%$2.01No image input+4
NVIDIA Nemotron 3 Ultra 550B A55B NVFP4Openwins 58%——No image inputGLM 5.2maxOpenwins 57%-39%$1.28No image inputGLM 5.1unstatedOpenwins 57%-39%$1.40 / $4.40No image inputGPT-5.5unstatedwins 59%—$5 / $30Prompts with >272K input tokensGPT-5.6 Solxhighwins 58%—$1.18GPT-5.4highwins 58%—$2.50 / $15GPT-5.6 Terraxhighwins 56%—$0.63Prompts with >272K input tokensGPT-5.6 Lunaxhighwins 55%—$0.085GPT-6 Astramaxwins 55%—$3.26Monitoring can return HTTP 403+2GPT-5.2highwins 53%—$1.75 / $14GPT-5.1highwins 53%—$1.25 / $10All OpenAI models →History
3 versionsBenchmarks
in Chat & KnowledgeFAQ
How much does o3 cost?›
$2 per 1M input tokens and $8 per 1M output tokens; cached input $0.50 per 1M.
Is o3 free to use?›
There is no free API; the cheapest paid price is $2 per 1M input tokens.
How good is o3, and what is it best at?›
#125 of 336 in Chat & Knowledge, #38 of 239 in Coding, #76 of 242 in Agents & Tool Use, #93 of 197 in Writing & Language, #69 of 125 in Vision & Documents. Strongest at: Instructions.
Is o3 better than o1?›
On Arena Text · German, o3 scores 1,420.1 vs 1,336.9 — higher.
How can I use o3?›
Through the API of OpenAI.
What is the context window of o3?›
200K tokens, with up to 100K output tokens.
When was o3 released? Is there a newer version?›
Released 2025-04-16. It is the current version in its line.
Is o3 open source?›
No, o3 is a closed model available through an API. The closest open-weights option here is Kimi K3.
Can o3 read images?›
It accepts text and images, PDF files as input.
What is o3?›
o3 is a closed language model from OpenAI, released Apr 2025, the successor to o1.
What are the best alternatives to o3?›
Muse Spark 1.3 (cheaper), GPT-5.6 Luna (better), Kimi K3 (open weights).