o3 pricing & benchmarks
o3 is available from OpenAI at $2.00 per million input tokens and $8.00 per million output tokens ($3.50 blended at 3:1). It accepts up to 200,000 tokens of context. o3 is a well-rounded and powerful model across domains. It sets a new standard for math, science, coding, and visual reasoning tasks. It also excels at technical writing and instruction-following....
Pricing
Per million tokens · OpenRouter
Input$2.00
Output$8.00
Blended (3:1)$3.50
Specification
openai/o3
Context window200K
Max output100K
ReleasedApr 2025
LicenceProprietary
Modalitiesin:text, in:image, in:file, out:text
Benchmarks
Independently run — not vendor self-reports. Every score links its source.
| Benchmark | Score | Config | Run | Source |
|---|---|---|---|---|
| GPQA Diamond | 81.8% ±2.1 | — | 2025-04-16 | Independently run · Epoch AI |
| SWE-bench Verified | 62.3% ±2.2 | — | 2026-02-12 | Independently run · Epoch AI |
| SimpleQA Verified | 53.0% ±1.6 | — | 2025-12-09 | Independently run · Epoch AI |
| OTIS Mock AIME | 84.4% ±5.5 | — | 2026-08-07 | Independently run · Epoch AI |
Scores published by Epoch AI, 'AI Benchmarking Hub', used under CC BY 4.0.
Cheaper models that score at least as well on GPQA Diamond
Strictly lower blended price AND an equal-or-higher GPQA Diamond score. One benchmark is one dimension — a model that wins here may still be weaker at your specific task.
| Model | Provider | Blended $/1M | GPQA Diamond | |
|---|---|---|---|---|
| DeepSeek V4 Flash 0731 | DeepSeek | $0.113 (−97%) | 91.0% | Compare → |
| GPT-5.6 Luna | OpenAI | $0.225 (−94%) | 91.6% | Compare → |
| GLM 5.2 | Zhipu AI | $0.387 (−89%) | 91.9% | Compare → |
| Qwen3.6 Flash | Alibaba | $0.422 (−88%) | 83.3% | Compare → |
| DeepSeek V4 Pro | DeepSeek | $0.544 (−84%) | 90.9% | Compare → |
Compare o3
FAQ
How much does o3 cost?
o3 costs $2.00 per million input tokens and $8.00 per million output tokens on OpenRouter. At a 3:1 input:output mix that blends to $3.50 per million tokens.
What is o3's context window?
o3 accepts up to 200,000 tokens of context, and can generate up to 100,000 output tokens.
How good is o3 on benchmarks?
o3 scores 81.8% on GPQA Diamond, independently run and published by Epoch AI. 4 benchmark results are listed on this page, each with its run date and source.
Is there a cheaper model as good as o3?
Yes — 5 models in our catalogue cost less per token than o3 and score at least as high on the same benchmark. The cheapest is DeepSeek V4 Flash 0731 at $0.113 per million tokens blended.