ModelRefs / Claude 3 Opus vs o3 Pro
Claude 3 Opus vs o3 Pro
Claude 3 Opus vs o3 Pro: side-by-side benchmarks, pricing, context windows, coding ability and deployment. Pick the right model for your stack.
Overview
Claude 3 Opus: Claude 3 Opus is Anthropic's February 2024 frontier model and the most capable of the original Claude 3 family, accepting text and image input across a 200,000-token context window. The claude-3-opus-20240229 snapshot was deprecated on 30 June 2025 and retired on Anthropic-operated platforms on 5 January 2026, with Claude Opus 4.8 named as its replacement.
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 3 Opus 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 3 Opus vs o3 Pro at a glance
| Attribute | Claude 3 Opus | o3 Pro |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Released | 2024-02-29 | 2025-06-10 |
| Context window | 200,000 tokens | 200,000 tokens |
| Input price | $15/M tokens | $20/M tokens |
| Output price | $75/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 3 Opus 38%, o3 Pro 32%. Claude 3 Opus 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 Claude 3 Opus vs o3 Pro.
Frequently asked questions
Which is better, Claude 3 Opus or o3 Pro?
Claude 3 Opus and o3 Pro target different workloads — see the benchmark and pricing tables for a side-by-side answer.
Is Claude 3 Opus cheaper than o3 Pro?
Compare $0.0150 vs $0.0200 on this page.