o3
o3Alternatives?
CheaperGemini 3.8 Flashhigh+22%-57%*$3.49Sampling parameters are ignored+1BetterGPT-6 Lunalow+8%-94%$0.005Function calling only with none · Chat Completions+3
OpenMuse Spark Openxhigh+16%-43%$0.84Reasoning off leaves output unchanged · Self-hosted / llama.cpp+1CheaperGPT-6.1 Terramax+21%-43%$0.40CheaperGemini 3.6 Flashhigh+19%-57%*$1.60Gemini 3.8 Flashhigh+22%-57%*$3.49Sampling parameters are ignored+1GPT-6.1 Terramax+21%-43%$0.40Gemini 3.6 Flashhigh+19%-57%*$1.60
Qwen3.8 Max (0902)thinking+18%-14%$5.41Muse Spark 1.3xhigh+17%-43%$2.15Only auto tool_choice is supported+5GPT-6 Lunalow+8%-94%$0.005Function calling only with none · Chat Completions+3GPT-5.6 Lunalow+6%-87%$0.01
MiMo v2.5thinkingOpen+8%-95%$0.042GPT-6.1 Terralow+18%-43%$0.055Muse Glimmer 30BhighOpen+6%-86%$0.058Context: 200K → 131KMuse Spark OpenxhighOpen+16%-43%$0.84Reasoning off leaves output unchanged · Self-hosted / llama.cpp+1
DeepSeek V4.1 Flash 1017maxOpen+15%-85%$0.26Pass back reasoning_content · Chat Completions+4
Kimi K3maxOpen+15%+71%$2.00Sampling parameters are fixed+3Qwen3.8 FlashthinkingOpen+14%-93%$0.37max_tokens range · QwenCloud+5Kimi K2.6thinkingOpen+13%-51%$0.71GPT-6 Astramedium+21%—$1.54Monitoring can return HTTP 403+2GPT-6.1 Solmedium+20%—$0.21Remove unsupported parameters+5GPT-6.1 Terramedium+18%—$0.095GPT-5.6 Solmedium+16%—$0.50GPT-5.5medium+16%—$0.77Prompts with >272K input tokensGPT-6 Solmedium+15%—$0.25GPT-5.3 Codexxhigh+12%—$1.75 / $14DeprecatedGPT-6 Lunamedium+11%—$0.017Function calling only with none · Chat Completions+3All OpenAI models →FAQ
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 Mini?›
On MMMU-Pro (vision), o3 scores 70.1 vs 70.1 — 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 Muse Spark Open.
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-6 Luna (better), Muse Spark Open (open weights).