o3
o3Rankingin thinking mode?
Alternatives?
CheaperGemini 3 Flash Previewunstated+18%-68%$0.50 / $3
BetterClaude Opus 5unstated+34%+186%$5 / $25
OpenKimi K3unstated+4%+71%$3 / $15Sampling parameters are fixed+3CheaperGemini 3.6 Flashunstated+12%-57%*$0.75 / $3.75CheaperClaude Haiku 5.5unstated+9%-94%$0.10 / $0.50Remove sampling parameters+5Gemini 3 Flash Previewunstated+18%-68%$0.50 / $3Gemini 3.6 Flashunstated+12%-57%*$0.75 / $3.75Claude Haiku 5.5unstated+9%-94%$0.10 / $0.50Remove sampling parameters+5
Muse Sparkunstated+9%-43%$1.25 / $4.25Only n=1 · Meta / Chat Completions+1
Grok 4.7unstated+5%-14%$2 / $6Reasoning cannot be disabled+4Claude Opus 5unstated+34%+186%$5 / $25Gemini 3.1 Pro Previewunstated+25%+29%$2 / $12Cannot use both thinking controlsGemini 4 Argonunstated+24%+14%*$2 / $10Synchronous output stops at 65,536+2Claude Fable 5unstated+19%+471%$10 / $50Gemini 3 Flash Previewunstated+18%-68%$0.50 / $3Kimi K3unstatedOpen+4%+71%$3 / $15Sampling parameters are fixed+3
MiniMax M3unstatedOpen-2%-85%$0.30 / $1.20No strict JSON+1
MiMo v2.6 ProunstatedOpen-5%-84%$0.43 / $0.87Pass back reasoning_content+3
Hy4 previewOpen-9%-64%$0.83 / $2.50No image input
GLM 5.3unstatedOpen-9%-39%$1.40 / $4.40No image input+4GPT-5.1unstated+12%—$1.25 / $10GPT-5.2unstated+5%—$1.75 / $14GPT-5unstated+5%—$1.25 / $10GPT-5.5unstated+4%—$5 / $30Prompts with >272K input tokensGPT-6.1 Solunstated+3%—$2 / $10Remove unsupported parameters+5GPT-6 Astraunstated+3%—$10 / $50Monitoring can return HTTP 403+2GPT-6 Solunstatedsame—$2 / $10GPT-6 Lunaunstated-5%—$0.10 / $0.50Function calling only with none · Chat Completions+3All OpenAI models →Benchmarks
all categoriesFAQ
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?›
#123 of 334 in Chat & Knowledge, #38 of 239 in Coding, #76 of 242 in Agents & Tool Use, #81 of 195 in Writing & Language, #68 of 124 in Vision & Documents. Strongest at: Instructions.
Is o3 better than Claude Sonnet 5?›
On Vals MedCode, o3 scores 47.3 vs 47.5 — 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 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?›
Gemini 3 Flash Preview (cheaper), Claude Opus 5 (better), Kimi K3 (open weights).