Claude Opus 4.5 vs o3-pro
Claude Opus 4.5 (2025) and o3-pro (2025) are frontier-tier reasoning models from Anthropic and OpenAI. Claude Opus 4.5 ships a 200k-token context window, while o3-pro ships a 200k-token context window. On Google-Proof Q&A, Claude Opus 4.5 leads by 3 pts. On pricing, Claude Opus 4.5 costs $5/1M input tokens versus $20/1M for the alternative. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.
Claude Opus 4.5 is ~300% cheaper at $5/1M; pay for o3-pro only for coding workflow support.
Decision scorecard
Local evidence first| Signal | Claude Opus 4.5 | o3-pro |
|---|---|---|
| Best for | reasoning-heavy apps, multimodal apps, and tool-calling agents | reasoning-heavy apps, multimodal apps, and tool-calling agents |
| Decision fit | Coding, RAG, and Agents | Coding, RAG, and Agents |
| Context window | 200k | 200k |
| Cheapest output | $25/1M tokens | $80/1M tokens |
| Provider routes | 6 tracked | 3 tracked |
| Shared benchmarks | Google-Proof Q&A leader | 2 shared |
Decision tradeoffs
- Claude Opus 4.5 holds a shared-benchmark lead on Google-Proof Q&A, ahead by 3 points.
- Claude Opus 4.5 has the lower cheapest tracked output price at $25/1M tokens.
- Claude Opus 4.5 has broader tracked provider coverage for fallback and route flexibility.
- Local decision data tags Claude Opus 4.5 for Coding, RAG, and Agents.
- o3-pro holds a shared-benchmark lead on Aider Polyglot, ahead by 12.9 points.
- Local decision data tags o3-pro for Coding, RAG, and Agents.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output route or tier on this page.
Claude Opus 4.5
$10,250
Cheapest tracked route/tier: Microsoft Foundry
o3-pro
$36,000
Cheapest tracked route/tier: OpenRouter
Estimated monthly gap: $25,750. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on OpenRouter and Vercel AI Gateway; start route-level A/B tests there.
- o3-pro is $55/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Provider overlap exists on OpenRouter and Vercel AI Gateway; start route-level A/B tests there.
- Claude Opus 4.5 is $55/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-11-01 | 2025-06-10 |
| Context window | 200k | 200k |
| Parameters | — | — |
| Architecture | Decoder Only | Decoder Only |
| License | Proprietary | Proprietary |
| Openness | Proprietary | Proprietary |
| Weights | Not released | Not released |
| Code | Unknown | Unknown |
| Commercial use | Commercial use: conditional | Commercial use: conditional |
| Knowledge cutoff | 2025-12 | 2025-08 |
Pricing and availability
| Pricing attribute | Claude Opus 4.5 | o3-pro |
|---|---|---|
| Input price | $5/1M tokens | $20/1M tokens |
| Output price | $25/1M tokens | $80/1M tokens |
| Providers |
Capabilities
| Capability | Claude Opus 4.5 | o3-pro |
|---|---|---|
| Vision | Yes | Yes |
| Multimodal | Yes | Yes |
| Reasoning | Yes | Yes |
| JSON / Tool use | Yes | Yes |
| Structured outputs | Yes | Yes |
| Code execution | Yes | Yes |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
| Benchmark | Claude Opus 4.5 | o3-pro |
|---|---|---|
| Google-Proof Q&A | 87.0 | 84.0 |
| Aider Polyglot | 72.0 | 84.9 |
Continue comparing
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- Claude Opus 4.5 vs Kimi K2.6
- Claude 3.7 Sonnet vs Claude Opus 4.5
- Claude Opus 4.5 vs GLM-5.1
- Claude Opus 4.5 vs Xiaomi MiMo-V2.5
Popular comparisons for Claude Opus 4.5
Popular comparisons for o3-pro
Last reviewed: 2026-07-26. Data sourced from public model cards and provider documentation.