OpenAI

o3

Released Apr 16, 2025 · knowledge cutoff 2024-06

Status: Deprecated
Location: United States
Modality: Multimodal
Context window: 200K
Max output: 100K
Speed: —
Price ($/MTok in / out): $2 / $8
Cost per task: —
Open weights: No

Benchmarks7 of 8 reported

MMLU-Pro

85.6%

GPQA Diamond

83.3%

SWE-bench Verified

69.1%

AIME (latest)

91.6%

Humanity's Last Exam

20.3%

LMArena Elo

1418

ARC-AGI-2

6.5%

Terminal-Bench 2.1

—

Strengths & weaknesses

Strengths

Thinks with tools in the loop — searches, runs code, then reasons over what came back
Stays with a hard problem across many steps instead of settling early
Reasoning effort is tunable, so one model covers quick and deep work

Weaknesses

Invents confident specifics about its own actions, including claiming it ran code it never ran
Latency swings wildly with effort — the same prompt takes seconds or minutes
Clipped, telegraphic prose that reads as brusque after the 4o line

Pricing reflects the June 2025 cut from $10/$40. OpenAI is retiring o3 from ChatGPT on 2026-08-26 following a 90-day sunset notice; marked deprecated ahead of that date. API availability after the ChatGPT retirement was not specified in the announcement.

For developers

API model strings

Not researched

Licence

Proprietary — weights not released

Retirement

Retirement date not researched

Lineage

No recorded predecessor

News