ModelRefs / o3 Pro vs Claude Sonnet 4
o3 Pro vs Claude Sonnet 4
o3 Pro vs Claude Sonnet 4: side-by-side benchmarks, pricing, context windows, coding ability and deployment. Pick the right model for your stack.
Overview
Claude Sonnet 4: Claude Sonnet 4 is Anthropic's May 2025 hybrid-reasoning model for coding, visual reasoning, tool use, and agent workflows. The dated claude-sonnet-4-20250514 snapshot was retired on Anthropic-operated platforms on June 15, 2026 and is retained as a historical evaluation and migration reference.
o3 Pro: o3 Pro is OpenAI's highest-capability reasoning model, applying extended compute at inference time to solve complex scientific, mathematical, and programming problems. It achieved the highest published scores on ARC-AGI-2 and competitive programming benchmarks at its June 2025 release.
Context window: Claude Sonnet 4 accepts up to 200,000 tokens, o3 Pro up to 200,000. Confirm the limit for your specific deployment channel before relying on it.
Claude Sonnet 4 vs o3 Pro at a glance
| Attribute | Claude Sonnet 4 | o3 Pro |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Released | 2025-05-22 | 2025-06-10 |
| Context window | 200,000 tokens | 200,000 tokens |
| Input price | $3/M tokens | $20/M tokens |
| Output price | $15/M tokens | $80/M tokens |
| Licence | Proprietary | Proprietary |
| Self-hostable | No, hosted only | No, hosted only |
| Modalities | text, vision | text, vision |
Where they differ most
- Reasoning: Claude Sonnet 4 73%, o3 Pro 32%. Claude Sonnet 4 leads on this dimension.
- Coding: Claude Sonnet 4 57%, o3 Pro 85%. o3 Pro leads on this dimension.
Capability scores are ModelRefs' own derived signals, not vendor claims or benchmark results. Validate against your own workload before relying on them.
Continue your research
Use these connected ModelRefs sections to compare alternatives, inspect implementation paths, and review the evidence and governance boundaries relevant to o3 Pro vs Claude Sonnet 4.
Frequently asked questions
Which is better, o3 Pro or Claude Sonnet 4?
o3 Pro and Claude Sonnet 4 target different workloads — see the benchmark and pricing tables for a side-by-side answer.
Is o3 Pro cheaper than Claude Sonnet 4?
Compare $0.0200 vs $0.00300 on this page.