ModelRefs / o3 vs Claude 3.7 Sonnet
o3 vs Claude 3.7 Sonnet
o3 vs Claude 3.7 Sonnet: side-by-side benchmarks, pricing, context windows, coding ability and deployment. Pick the right model for your stack.
Overview
Claude 3.7 Sonnet: Claude 3.7 Sonnet is Anthropic's February 2025 hybrid reasoning model, combining immediate answers with an optional extended thinking mode in a single model rather than two. Thinking can be budgeted by token count up to a 128,000-token output limit, across a 200,000-token context window. The claude-3-7-sonnet-20250219 snapshot was deprecated on 28 October 2025 and retired on Anthropic-operated platforms on 19 February 2026.
o3: o3 is OpenAI's April 2025 reasoning model, applying deliberate chain-of-thought computation at inference time to mathematics, science and competitive programming tasks, and the release that brought OpenAI's scalable test-time compute approach to its production API. OpenAI has since deprecated it, scheduling the o3-2025-04-16 snapshot to shut down on 11 December 2026 with gpt-5.6-sol as the replacement.
Context window: Claude 3.7 Sonnet accepts up to 200,000 tokens, o3 up to 200,000. Confirm the limit for your specific deployment channel before relying on it.
Claude 3.7 Sonnet vs o3 at a glance
| Attribute | Claude 3.7 Sonnet | o3 |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Released | 2025-02-24 | 2025-04-16 |
| Context window | 200,000 tokens | 200,000 tokens |
| Input price | $3/M tokens | $10/M tokens |
| Output price | $15/M tokens | $40/M tokens |
| Licence | Proprietary | Proprietary |
| Self-hostable | No, hosted only | No, hosted only |
| Modalities | text, vision | text, vision |
Where they differ most
- Cost Efficiency: Claude 3.7 Sonnet 37%, o3 13%. Claude 3.7 Sonnet 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 vs Claude 3.7 Sonnet.
Frequently asked questions
Which is better, o3 or Claude 3.7 Sonnet?
o3 and Claude 3.7 Sonnet target different workloads — see the benchmark and pricing tables for a side-by-side answer.
Is o3 cheaper than Claude 3.7 Sonnet?
Compare $0.0100 vs $0.00300 on this page.