Claude Sonnet 4.5 vs Qwen2.5-72B-Instruct
Claude Sonnet 4.5 (2025) and Qwen2.5-72B-Instruct (2024) are frontier reasoning models from Anthropic and Alibaba. Claude Sonnet 4.5 ships a 200k-token context window, while Qwen2.5-72B-Instruct ships a 128k-token context window. On Google-Proof Q&A, Claude Sonnet 4.5 leads by 45.0 pts. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.
Claude Sonnet 4.5 is safer overall; choose Qwen2.5-72B-Instruct when provider fit matters.
Decision scorecard
Local evidence first| Signal | Claude Sonnet 4.5 | Qwen2.5-72B-Instruct |
|---|---|---|
| Best for | reasoning-heavy apps, multimodal apps, and tool-calling agents | provider-routed production |
| Decision fit | Coding, RAG, and Agents | Coding, RAG, and Long context |
| Context window | 200k | 128k |
| Cheapest output | $15/1M tokens | $0.54/1M tokens |
| Provider routes | 8 tracked | 7 tracked |
| Shared benchmarks | Google-Proof Q&A leader | 1 shared |
Decision tradeoffs
- Claude Sonnet 4.5 holds a shared-benchmark lead on Google-Proof Q&A, ahead by 45.0 points.
- Claude Sonnet 4.5 has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Claude Sonnet 4.5 has broader tracked provider coverage for fallback and route flexibility.
- Claude Sonnet 4.5 uniquely exposes Vision, Multimodal, and Reasoning in local model data.
- Local decision data tags Claude Sonnet 4.5 for Coding, RAG, and Agents.
- Qwen2.5-72B-Instruct has the lower cheapest tracked output price at $0.54/1M tokens.
- Local decision data tags Qwen2.5-72B-Instruct for Coding, RAG, and Long context.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output route or tier on this page.
Claude Sonnet 4.5
$6,150
Cheapest tracked route/tier: Microsoft Foundry
Qwen2.5-72B-Instruct
$279
Cheapest tracked route/tier: Chutes AI
Estimated monthly gap: $5,871. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on OpenRouter and Replicate API; start route-level A/B tests there.
- Qwen2.5-72B-Instruct is $14.46/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for Vision, Multimodal, and Reasoning before moving production traffic.
- Provider overlap exists on Replicate API and OpenRouter; start route-level A/B tests there.
- Claude Sonnet 4.5 is $14.46/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Claude Sonnet 4.5 adds Vision, Multimodal, and Reasoning in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-09-29 | 2024-06-07 |
| Context window | 200k | 128k |
| Parameters | — | 72.7B |
| Architecture | Decoder Only | Decoder Only |
| License | Proprietary | Apache 2.0OSI-approved |
| Openness | Proprietary | Open source |
| Weights | Not released | Available |
| Code | Unknown | Unknown |
| Commercial use | Commercial use: conditional | Commercial use: permitted |
| Knowledge cutoff | 2025-12 | - |
Pricing and availability
| Pricing attribute | Claude Sonnet 4.5 | Qwen2.5-72B-Instruct |
|---|---|---|
| Input price |
| $0.18/1M tokens |
| Output price |
| $0.54/1M tokens |
| Providers |
Capabilities
| Capability | Claude Sonnet 4.5 | Qwen2.5-72B-Instruct |
|---|---|---|
| Vision | Yes | No |
| Multimodal | Yes | No |
| Reasoning | Yes | No |
| JSON / Tool use | Yes | No |
| Structured outputs | Yes | Yes |
| Code execution | No | No |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
| Benchmark | Claude Sonnet 4.5 | Qwen2.5-72B-Instruct |
|---|---|---|
| Google-Proof Q&A | 83.4 | 38.4 |
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Last reviewed: 2026-07-26. Data sourced from public model cards and provider documentation.