Claude Opus 4.5 vs Gemini 3 Pro
Claude Opus 4.5 (2025) and Gemini 3 Pro (2025) are frontier reasoning models from Anthropic and Google DeepMind. Claude Opus 4.5 ships a 200k-token context window, while Gemini 3 Pro ships a 1m-token context window. On MMLU PRO, Gemini 3 Pro leads by 2.9 pts. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.
Gemini 3 Pro is ~300% cheaper at $1.25/1M; pay for Claude Opus 4.5 only for coding workflow support.
Decision scorecard
Local evidence first| Signal | Claude Opus 4.5 | Gemini 3 Pro |
|---|---|---|
| Best for | reasoning-heavy apps, multimodal apps, and tool-calling agents | multimodal apps, tool-calling agents, and long-context analysis |
| Decision fit | Coding, RAG, and Agents | Coding, RAG, and Agents |
| Context window | 200k | 1m |
| Cheapest output | $25/1M tokens | $5/1M tokens |
| Provider routes | 6 tracked | 2 tracked |
| Shared benchmarks | 8 shared | MMLU PRO leader |
Decision tradeoffs
- Claude Opus 4.5 holds a shared-benchmark lead on SWE-bench Verified, ahead by 4.7 points.
- Claude Opus 4.5 has broader tracked provider coverage for fallback and route flexibility.
- Claude Opus 4.5 uniquely exposes Reasoning and Structured outputs in local model data.
- Local decision data tags Claude Opus 4.5 for Coding, RAG, and Agents.
- Gemini 3 Pro holds a shared-benchmark lead on MMLU PRO, ahead by 2.9 points.
- Gemini 3 Pro has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Gemini 3 Pro has the lower cheapest tracked output price at $5/1M tokens.
- Local decision data tags Gemini 3 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
Gemini 3 Pro
$2,250
Cheapest tracked route/tier: GCP Vertex AI
Estimated monthly gap: $8,000. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on GCP Vertex AI; start route-level A/B tests there.
- Gemini 3 Pro is $20/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for Reasoning and Structured outputs before moving production traffic.
- Provider overlap exists on GCP Vertex AI; start route-level A/B tests there.
- Claude Opus 4.5 is $20/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Claude Opus 4.5 adds Reasoning and Structured outputs in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-11-01 | 2025-12-11 |
| Context window | 200k | 1m |
| 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 | 2025-01 |
Pricing and availability
| Pricing attribute | Claude Opus 4.5 | Gemini 3 Pro |
|---|---|---|
| Input price | $5/1M tokens | $1.25/1M tokens |
| Output price | $25/1M tokens | $5/1M tokens |
| Providers |
Capabilities
| Capability | Claude Opus 4.5 | Gemini 3 Pro |
|---|---|---|
| Vision | Yes | Yes |
| Multimodal | Yes | Yes |
| Reasoning | Yes | No |
| JSON / Tool use | Yes | Yes |
| Structured outputs | Yes | No |
| Code execution | Yes | Yes |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
| Benchmark | Claude Opus 4.5 | Gemini 3 Pro |
|---|---|---|
| MMLU PRO | 88.9 | 91.8 |
| SWE-bench Verified | 80.9 | 76.2 |
| SWE-bench Pro | 41.8 | 42.5 |
| Google-Proof Q&A | 87.0 | 91.9 |
| Massive Multi-discipline Multimodal Understanding | 80.7 | 81.0 |
| Chatbot Arena | 1466.0 | 1486.0 |
| MMMU Pro | 73.9 | 81.0 |
| BFCL | 77.5 | 72.5 |
Continue comparing
Popular comparisons for Claude Opus 4.5
Popular comparisons for Gemini 3 Pro
Last reviewed: 2026-07-26. Data sourced from public model cards and provider documentation.