o3
o3Alternatives?
CheaperMuse Spark 1.2unstated+17%-43%$1.25 / $4.25Only auto tool_choice is supported+1
BetterClaude Haiku 4.5thinking+11%-43%$0.23
OpenGLM 5.3 Flashunstated+16%-93%$0.15 / $0.50Defaults to max · Self-hosted+4CheaperClaude Haiku 5.5unstated+17%-94%$0.10 / $0.50Remove sampling parameters+5
CheaperGrok 4.7unstated+17%-14%$2 / $6Reasoning cannot be disabled+4Muse Spark 1.2unstated+17%-43%$1.25 / $4.25Only auto tool_choice is supported+1Claude Haiku 5.5unstated+17%-94%$0.10 / $0.50Remove sampling parameters+5Grok 4.7unstated+17%-14%$2 / $6Reasoning cannot be disabled+4GLM 5.3 FlashunstatedOpen+16%-93%$0.15 / $0.50Defaults to max · Self-hosted+4Muse Spark 1.1unstated+16%-43%$1.25 / $4.25Only n=1 · Meta / Chat Completions+1Claude Haiku 4.5thinking+11%-43%$0.23Claude Sonnet 4.5thinking+10%+71%$0.56Claude Opus 5.5unstated+19%+129%$4 / $20No forced tool use+5Claude Fable 5.1unstated+19%+471%$10 / $50Replace forced tool_choice+5Claude Sonnet 5.5unstated+19%+14%$2 / $10No forced tool use+5GLM 5.3 FlashunstatedOpen+16%-93%$0.15 / $0.50Defaults to max · Self-hosted+4GLM 5.3unstatedOpen+16%-39%$1.40 / $4.40No image input+4
MiMo v2.6 ProunstatedOpen+15%-84%$0.43 / $0.87Pass back reasoning_content+3
Kimi K3unstatedOpen+15%+71%$3 / $15Sampling parameters are fixed+3
MiniMax M3unstatedOpen+14%-85%$0.30 / $1.20No strict JSON+1GPT-5.1unstated+15%—$1.25 / $10GPT-6 Astraunstated+15%—$10 / $50Monitoring can return HTTP 403+2GPT-5.5unstated+13%—$5 / $30Prompts with >272K input tokensGPT-6.1 Solunstated+13%—$2 / $10Remove unsupported parameters+5GPT-5.6 Solunstated+11%—$4 / $20GPT-5.6 Lunaunstated+10%—$0.20 / $1.20GPT-5.2unstated+10%—$1.75 / $14GPT-6 Lunaunstated+9%—$0.10 / $0.50Function calling only with none · Chat Completions+3All 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 Qwen3.6 Plus?›
On Vals MedScribe, o3 scores 76.7 vs 77 — 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 GLM 5.3 Flash.
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 1.2 (cheaper), Claude Haiku 4.5 (better), GLM 5.3 Flash (open weights).