o3
OpenAI's frontier reasoning model — high-compute, extended chain-of-thought for hard math, science, and code.
Pricing
Input$2 / 1M checked Jul 19, 2026
Cached input$2.50 / 1M
Output$8 / 1M checked Jul 19, 2026
Reasoning token usage is included in output cost.
Cost bandPremium
Free tierNo free API tier.
Limits
Context window200k checked Jul 19, 2026
Max output100k
Knowledge cutoffJun 1, 2024
DeploymentOpenAI API
OpenAI-compatible APIYes
ModalitiesText, Image input
Where it fits
Best forOlympiad-level math, advanced coding, PhD-level scientific reasoning where quality trumps cost.
Business fitReserve for the hardest problems; cost is high but so is the ceiling.
Capabilities
Extended thinkingFunction callingStructured outputsVision
Benchmark scores
Composite94 / 100
Coding96 / 100 (SWE-bench Verified)
Reasoning98 / 100 (GPQA Diamond)
Long context90 / 100 (RULER 200K)
Vision88 / 100 (MMMU)
Instruction following94 / 100 (IFEval)
Editorial aggregate of published benchmark results as of May 1, 2025. These are not independent measurements run by this site.
Change history
USD per 1M tokens. Steps mark recorded repricings; dots link to the events below.
- Jul 19, 2026Price cuto3 output price cut
$40 / 1Mto $8 / 1M OpenRouter directory - Jul 19, 2026Price cuto3 input price cut
$10 / 1Mto $2 / 1M OpenRouter directory
Data
Last checkedJul 19, 2026
Cross-checked againstopenrouter.ai/openai/o3
Verify with provider documentation before committing spend. Report an error and it gets fixed with a logged correction.