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
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OpenAI
OpenAIReasoningRETIRED

o1-preview

Reasoning

Public preview of o1, retired when o1 reached GA. Listed for historical reference.

o1-preview is a reasoning AI model from OpenAI. It costs $15.000 per million input tokens and $60.000 per million output tokens (blended $28.500/M), with a 128K-token context window.

Official model page ↗Provider pricing ↗API docs ↗Compare with another model →Estimate monthly cost →
INPUT
$15.000/M
per million input tokens
OUTPUT
$60.000/M
per million output tokens
BLENDED 70/30
$28.500/M
default reference rate · how it's calculated →
CONTEXT
128K
128,000 tokens
Benchmarks
vs. best public score
Scores inherited from o1 — this is a hosted variant of the same open-weights model, so the underlying benchmark scores are identical.
MMLU91%
Multitask academic knowledge across 57 subjects.
GPQA Diamond78%
Graduate-level science questions, "Google-proof".
MATH94%
High-school competition math problems.
HumanEval89%
Python function synthesis from docstrings.
LMArena Elo1355 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.
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GPT-5.2
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in $1.750/Mout $14.000/M
GPT-5.2-Codex
Coding · 400K ctx
in $1.750/Mout $14.000/M
GPT-5
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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 o1-preview cost?

o1-preview costs $15.000 per million input tokens and $60.000 per million output tokens, for a blended reference rate of $28.500 per million tokens.

What is o1-preview's context window?

o1-preview supports up to 128K tokens of context (128,000 tokens).

What is o1-preview best for?

Public preview of o1, retired when o1 reached GA. Listed for historical reference.

Who makes o1-preview?

o1-preview is developed and served by OpenAI.