token.app › Compare › o3 vs Claude Opus 5
o3 vs Claude Opus 5
Claude Opus 5 leads on 3 of 3 shared benchmarks. o3 is 2.9× cheaper per token on a blended 3:1 basis. Claude Opus 5 accepts the larger context window (1M).
Head to head
Blended price uses a 3:1 input:output mix
| o3 | Claude Opus 5 | |
|---|---|---|
| Provider | OpenAI | Anthropic |
| Input $/1M | $2.00 | $5.00 |
| Output $/1M | $8.00 | $25.00 |
| Blended $/1M | $3.50 | $10.00 |
| Context window | 200K | 1M |
| Max output | 100K | 128K |
| Released | Apr 2025 | Jul 2026 |
| Licence | Proprietary | Proprietary |
| GPQA Diamond | 81.8% | 93.9% |
| FrontierMath T1–3 | 33.3% | 85.6% |
| OTIS Mock AIME | 84.4% | 98.9% |
Benchmark scores independently run and published by Epoch AI, 'AI Benchmarking Hub', used under CC BY 4.0. Only benchmarks with a score for BOTH models are compared.
Choose o3 if…
- Costs less per token — $3.50 vs $10.00 blended
Choose Claude Opus 5 if…
- Higher GPQA Diamond (93.9% vs 81.8%)
- Higher FrontierMath T1–3 (85.6% vs 33.3%)
- Higher OTIS Mock AIME (98.9% vs 84.4%)
- Larger context window (1M)
- Newer model (released Jul 2026)
FAQ
Which is better, o3 or Claude Opus 5?
Across the 3 benchmarks both models have independently-run scores for, o3 leads on 0 and Claude Opus 5 leads on 3. Benchmarks are one input — price and context window are on this page too.
Is o3 cheaper than Claude Opus 5?
o3 is cheaper: $3.50 versus $10.00 per million tokens blended at 3:1 input:output. Input alone: $2.00 vs $5.00. Output alone: $8.00 vs $25.00.
What context windows do o3 and Claude Opus 5 have?
o3: 200,000 tokens. Claude Opus 5: 1,000,000 tokens.
Who makes o3 and Claude Opus 5?
o3 is made by OpenAI. Claude Opus 5 is made by Anthropic.