o3
o3Alternatives?
CheaperGemini 3.8 Flashhigh×20.6-57%*$3.49Sampling parameters are ignored+1BetterGPT-5.6 Lunamedium+70%-87%$0.016
OpenDeepSeek V4.1 Flash 1017high×18.5-85%$0.30 / $1.20Pass back reasoning_content · Chat Completions+4
CheaperGrok 4.6high×15.2-14%$1.48
CheaperGLM 5.3 FlashmaxOpen×14.9-93%$0.28Defaults to max · Self-hosted+4Gemini 3.8 Flashhigh×20.6-57%*$3.49Sampling parameters are ignored+1DeepSeek V4.1 Flash 1017highOpen×18.5-85%$0.30 / $1.20Pass back reasoning_content · Chat Completions+4Grok 4.6high×15.2-14%$1.48GLM 5.3 FlashmaxOpen×14.9-93%$0.28Defaults to max · Self-hosted+4Gemini 3.6 Flashhigh×14.5-57%*$1.60GPT-5.6 Lunamedium+70%-87%$0.016GPT-6 Lunamedium×4.3-94%$0.017Function calling only with none · Chat Completions+3
Claude Haiku 5.5low+76%-94%$0.024Remove sampling parameters+5GPT-6.1 Sollow×17.3+14%$0.13Remove unsupported parameters+5GPT-6 Sollow×5.7+14%$0.13DeepSeek V4.1 Flash 1017highOpen×18.5-85%$0.30 / $1.20Pass back reasoning_content · Chat Completions+4GLM 5.3 FlashmaxOpen×14.9-93%$0.28Defaults to max · Self-hosted+4DeepSeek V4 Pro 0813highOpen×14.2-43%$1.32 / $3.96No image input+5
Kimi K3maxOpen×13.7+71%$2.00Sampling parameters are fixed+3
Muse Spark OpenxhighOpen×12.7-43%$0.84Reasoning off leaves output unchanged · Self-hosted / llama.cpp+1GPT-6 Astramedium×21.5—$1.54Monitoring can return HTTP 403+2GPT-5.4 Proxhigh×20.5—$30 / $180No strict JSONGPT-6.1 Solmedium×20.2—$0.21Remove unsupported parameters+5GPT-5.5 Prohigh×20.1—$30 / $180GPT-5.6 Solmedium×15.7—$0.50GPT-5.5medium×15.7—$0.77Prompts with >272K input tokensGPT-5.4medium×13—$2.50 / $15GPT-6 Solmedium×11—$0.25All OpenAI models →Benchmarks
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 GPT-5.4 Nano?›
On ARC-AGI-2 · public evaluation, o3 scores 4.5 vs 5.1 — about the same.
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 DeepSeek V4.1 Flash 1017.
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?›
Gemini 3.8 Flash (cheaper), GPT-5.6 Luna (better), DeepSeek V4.1 Flash 1017 (open weights).