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o3
o3 is a well-rounded and powerful model across domains. It sets a new standard for math, science, coding, and visual reasoning tasks. It also excels at technical writing and instruction-following. Use it to think through multi-step problems that involve analysis across text, code, and images.
4/16/2025
200,000 tokens
#82 Vision (Overall)
Specifications
Modalities
Input
image
text
file
Output
text
Supported Parameters
include_reasoning
max_tokens
reasoning
response_format
seed
structured_outputs
tool_choice
tools
Max Output Tokens
100,000Data policy
- Prompt retention
- Unknown — we could not confirm
- Training
- Unknown — not declared
"Unknown" does not mean "safe". It means we could not confirm it.
Whether a provider trains on prompts is a declared value from our terms with them. Retention is determined from the upstream listing for every host this model can reach. Neither is guessed.
Frequently asked questions
- Is o3 available on FastMetal?
- Not at the moment. GPT-6.1 Sol, from the same lab, is available on the FastMetal API today.
- What is the context window of o3?
- 200,000 tokens, shared between the prompt and the response.
- How does o3 rank?
- #176 on the public arena's Japanese board (ELO 1,297). Ranks move as the leaderboard is updated.
Leaderboard
Text
spanishELO: 1,417
#123russianELO: 1,329
#231CodingELO: 1,416
#198MathELO: 1,382
#189Creative WritingELO: 1,301
#241Instruction FollowingELO: 1,343
#214Hard PromptsELO: 1,371
#215Multi-TurnELO: 1,339
#229OverallELO: 1,348
#223JapaneseELO: 1,297
#176ChineseELO: 1,357
#235KoreanELO: 1,291
#186EnglishELO: 1,362
#228frenchELO: 1,350
#211germanELO: 1,324
#198Vision
OverallELO: 1,216
#82Rankings: LMArena leaderboard dataset (lmarena-ai/leaderboard-dataset), CC BY 4.0, snapshot 2026-10-22; category names mapped and ratings rounded by FastMetal.