Claude Fable 5$22.000/MClaude Opus 4.8$11.000/MClaude Opus 4.7$11.000/MClaude Opus 4.6$11.000/MClaude Opus 4.5$33.000/MClaude Sonnet 3.7$6.600/MClaude Opus 3$33.000/MClaude 2.1$12.800/MClaude 2$12.800/MGPT-5.5$12.500/MGPT-5.2$5.425/MGPT-5.2-Codex$5.425/MGPT-5$3.875/MGPT-4.5$97.500/MGPT-4 Turbo Preview$16.000/MGPT-4$39.000/MGPT-4-32k$78.000/Mo3$19.000/Mo3-mini$2.090/Mo4-mini$2.090/Mo1$28.500/Mo1-mini$5.700/Mo1-preview$28.500/MGemini 3.5 Pro$5.000/MGemini 3.1 Pro$5.000/MGemini 3 Pro$5.000/MGemini 2.5 Pro$3.875/MGemini 1.5 Pro$2.375/MGemini 1.0 Ultra$12.000/MGemini 1.0 Pro$0.800/MClaude Fable 5$22.000/MClaude Opus 4.8$11.000/MClaude Opus 4.7$11.000/MClaude Opus 4.6$11.000/MClaude Opus 4.5$33.000/MClaude Sonnet 3.7$6.600/MClaude Opus 3$33.000/MClaude 2.1$12.800/MClaude 2$12.800/MGPT-5.5$12.500/MGPT-5.2$5.425/MGPT-5.2-Codex$5.425/MGPT-5$3.875/MGPT-4.5$97.500/MGPT-4 Turbo Preview$16.000/MGPT-4$39.000/MGPT-4-32k$78.000/Mo3$19.000/Mo3-mini$2.090/Mo4-mini$2.090/Mo1$28.500/Mo1-mini$5.700/Mo1-preview$28.500/MGemini 3.5 Pro$5.000/MGemini 3.1 Pro$5.000/MGemini 3 Pro$5.000/MGemini 2.5 Pro$3.875/MGemini 1.5 Pro$2.375/MGemini 1.0 Ultra$12.000/MGemini 1.0 Pro$0.800/M
BETA
Subscribe
← Back to Index·All OpenAI models
OpenAI
OpenAIReasoning

o3

Reasoning

Headline reasoning model in the o-series. Trades latency for depth on math, science and code benchmarks.

o3 is a reasoning AI model from OpenAI. It costs $10.000 per million input tokens and $40.000 per million output tokens (blended $19.000/M), with a 200K-token context window.

Modalities text, visionOfficial model page ↗Provider pricing ↗API docs ↗Compare with another model →Estimate monthly cost →
INPUT
$10.000/M
per million input tokens
OUTPUT
$40.000/M
per million output tokens
BLENDED 70/30
$19.000/M
default reference rate · how it's calculated →
CONTEXT
200K
200,000 tokens
What it's good at
  • Best-in-class on math & science benchmarks
  • Multi-step planning
  • Tool use
Typical use cases
  • Hard math/science questions
  • Complex coding
  • Research assistants
Benchmarks
vs. best public score
MMLU90%
Multitask academic knowledge across 57 subjects.
GPQA Diamond88%
Graduate-level science questions, "Google-proof".
MATH96%
High-school competition math problems.
HumanEval95%
Python function synthesis from docstrings.
SWE-bench Verified71%
Real GitHub issues solved end-to-end.
LMArena Elo1380 Elo
Crowd-sourced head-to-head preference Elo rating.
Hand-curated from each provider's published reports and public leaderboards. Methodology varies across sources — treat as directional rather than authoritative.
More from OpenAI
See all 25 →
GPT-5.5
Frontier · 1M ctx
in $5.000/Mout $30.000/M
GPT-5.2
Frontier · 400K ctx
in $1.750/Mout $14.000/M
GPT-5.2-Codex
Coding · 400K ctx
in $1.750/Mout $14.000/M
GPT-5
Frontier · 400K ctx
in $1.250/Mout $10.000/M
GPT-4.1
Frontier · 1M ctx
in $2.000/Mout $8.000/M
GPT-4.1 mini
Efficient · 1M ctx
in $0.400/Mout $1.600/M
Frequently asked questions

How much does o3 cost?

o3 costs $10.000 per million input tokens and $40.000 per million output tokens, for a blended reference rate of $19.000 per million tokens.

What is o3's context window?

o3 supports up to 200K tokens of context (200,000 tokens).

What is o3 best for?

o3 is well suited to Best-in-class on math & science benchmarks, Multi-step planning and Tool use.

Who makes o3?

o3 is developed and served by OpenAI.