o3
Reasoning-focused model in the o-series.
Specifications
- Context window
- 200,000 tokens
- Modality
- text, vision
- License
- proprietary
- Family
- o-series
- Release date
- 2025-04-16
Provider status
Timeline
Released
Initial public availability.
Pricing changes, lineage updates, and new benchmark results appear here as they happen. See the releases feed for the latest vendor activity.
API pricing
No API pricing recorded yet for o3.
Looking for consumer subscriptions? See OpenAI's plans →
Benchmarks
Model Index →| Benchmark | Score | Setting | Measured | Source |
|---|---|---|---|---|
| GPQA Diamond reasoning | 87.7% | 0-shot CoT | 2025-04-16 | source ↗ |
| AIME 2025 math | 88.9% | CoT high-effort | 2025-04-16 | source ↗ |
Want to see how o3 ranks across these? Open the Model Index leaderboard →
Infrastructure context
All intelligence →Compute, silicon, and capex events that shape o3's economics.
- Data center
Microsoft Fairwater Wisconsin: dedicated 1.5GW OpenAI training campus
Microsoft's Mount Pleasant, WI "Fairwater" campus — disclosed as a dedicated OpenAI training facility — reached 1.5GW configuration by Q1 2026 with NVIDIA GB200 NVL72 racks. The site uses closed-loop water cooling to reduce evaporative loss. Total Microsoft AI capex run-rate for FY26 is ~$110B.
Accelerators: GB200Power: 1.50 GWLocation: Mount Pleasant, WI - Data center
Stargate Abilene: OpenAI + Oracle + SoftBank $500B compute pact, first 1.2GW campus
Stargate is a 4-year, $500B compute commitment announced January 2025, jointly funded by OpenAI, Oracle, SoftBank, and MGX. The flagship 1.2GW Abilene, TX campus came online in phases through 2025–2026, anchored by Oracle Cloud. Additional sites in Wisconsin and New Mexico are under construction. Powers OpenAI's training fleet for GPT-5.5 and beyond.
Power: 1.20 GWCapex: $500BLocation: Abilene, TX