AI Model Comparison
Side-by-side comparison of pricing, context window, benchmarks, capabilities, and license. Every figure comes from the developer's own pages, last checked on ; each model's page lists its sources. A figure we could not source shows as a dash.
Model A — Anthropic
Claude Opus 4 is a model from Anthropic, released on May 22, 2025 alongside Claude Sonnet 4, with both near-instant and extended-thinking modes.
Model B — OpenAI
o3 is a reasoning model from OpenAI, released on April 16, 2025 (snapshot o3-2025-04-16). It takes text and image input and returns text.
| Property | Claude Opus 4 | OpenAI o3 |
|---|---|---|
| Released | May 22, 2025 | Apr 16, 2025 |
| Developer | Anthropic | OpenAI |
| Type | reasoning | reasoning |
| License | proprietary | proprietary |
| Context window | — | 200,000 |
| Parameters | — | — |
| Developer status | Retired | Deprecated |
| Input $/M tokens | — | $2.00 |
| Output $/M tokens | — | $8.00 |
Bold green values indicate the winner on that dimension where comparison is meaningful (lower price wins; bigger context wins; more open license wins; newer date wins). Prices are the ones each developer lists today; a model it no longer prices has none.
| Benchmark | Claude Opus 4 | OpenAI o3 |
|---|---|---|
| SWE-bench Verified | 72.5%Anthropic’s figure: all 500 tasks, without extended thinking. | 69.1%OpenAI’s figure, on 477 of the 500 tasks, as reported alongside GPT-5. |
Each score is its developer's own published figure, run under that developer's own test setup, so the two are not always measured the same way. The conditions are under each figure, and neither is marked as ahead unless both were run under the same stated conditions.
No exclusive capabilities
Programmatic access available at /api/ai/compare?a=claude-4-opus&b=o3. CORS is open. Citation guidance: /about/editorial-process.