Claude 3.7 Sonnet vs Claude Sonnet 4.5
Claude 3.7 Sonnet (2024) and Claude Sonnet 4.5 (2025) are frontier-tier reasoning models from Anthropic. Claude 3.7 Sonnet ships a 200k-token context window, while Claude Sonnet 4.5 ships a 200k-token context window. On MMLU PRO, Claude Sonnet 4.5 leads by 5.7 pts. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.
Pick Claude Sonnet 4.5 for general evaluation; token pricing is tied, so keep Claude 3.7 Sonnet only for already-validated prompts or route constraints.
Decision scorecard
Local evidence first| Signal | Claude 3.7 Sonnet | Claude Sonnet 4.5 |
|---|---|---|
| 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 | $15/1M tokens | $15/1M tokens |
| Provider routes | 6 tracked | 8 tracked |
| Shared benchmarks | 3 rows | MMLU PRO leader |
Decision tradeoffs
- Claude 3.7 Sonnet uniquely exposes Code execution in local model data.
- Local decision data tags Claude 3.7 Sonnet for Coding, RAG, and Agents.
- Claude Sonnet 4.5 holds a shared-benchmark lead on MMLU PRO, ahead by 5.7 points.
- Claude Sonnet 4.5 has broader tracked provider coverage for fallback and procurement flexibility.
- Local decision data tags Claude Sonnet 4.5 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 3.7 Sonnet
$6,150
Cheapest tracked route/tier: GCP Vertex AI
Claude Sonnet 4.5
$6,150
Cheapest tracked route/tier: Microsoft Foundry
Estimated monthly gap: $0.00. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on Anthropic, Snowflake Cortex, and GCP Vertex AI; start route-level A/B tests there.
- Cheapest tracked output pricing is tied, so migration risk shifts to quality, latency, and provider packaging.
- Check replacement coverage for Code execution before moving production traffic.
- Provider overlap exists on Snowflake Cortex, GCP Vertex AI, and Replicate API; start route-level A/B tests there.
- Cheapest tracked output pricing is tied, so migration risk shifts to quality, latency, and provider packaging.
- Claude 3.7 Sonnet adds Code execution in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2024-03-04 | 2025-09-29 |
| Context window | 200k | 200k |
| Parameters | — | — |
| Architecture | decoder only | decoder only |
| License | Proprietary | Proprietary |
| Openness | Proprietary | Proprietary |
| Commercial use | Commercial use with conditions | Commercial use with conditions |
| Knowledge cutoff | 2024-11 | 2025-12 |
Pricing and availability
| Pricing attribute | Claude 3.7 Sonnet | Claude Sonnet 4.5 |
|---|---|---|
| Input price | $3/1M tokens |
|
| Output price | $15/1M tokens |
|
| Providers |
Capabilities
| Capability | Claude 3.7 Sonnet | Claude Sonnet 4.5 |
|---|---|---|
| Vision | Yes | Yes |
| Multimodal | Yes | Yes |
| Reasoning | Yes | Yes |
| Function calling | Yes | Yes |
| Tool use | Yes | Yes |
| Structured outputs | Yes | Yes |
| Code execution | Yes | No |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
| Benchmark | Claude 3.7 Sonnet | Claude Sonnet 4.5 |
|---|---|---|
| MMLU PRO | 80.3 | 86.0 |
| SWE-bench Verified | 70.3 | 77.2 |
| Massive Multi-discipline Multimodal Understanding | 75.0 | 77.8 |
Deep dive
On shared benchmark coverage, MMLU PRO has Claude 3.7 Sonnet at 80.3 and Claude Sonnet 4.5 at 86, with Claude Sonnet 4.5 ahead by 5.7 points; SWE-bench Verified has Claude 3.7 Sonnet at 70.3 and Claude Sonnet 4.5 at 77.2, with Claude Sonnet 4.5 ahead by 6.9 points; Massive Multi-discipline Multimodal Understanding has Claude 3.7 Sonnet at 75 and Claude Sonnet 4.5 at 77.8, with Claude Sonnet 4.5 ahead by 2.8 points. The largest visible gap is 6.9 points on SWE-bench Verified, which matters most when that benchmark mirrors your workload. Treat isolated benchmark wins as directional, because provider routing, prompt style, and tool access can move real application results.
The capability footprint differs most on code execution: Claude 3.7 Sonnet. Both models share vision, multimodal input, reasoning mode, and function calling, so the practical split is not just feature count. Use those differences to decide whether the page is about raw model quality, agentic coding support, multimodal ingestion, or predictable structured API behavior.
For cost, Claude 3.7 Sonnet lists $3/1M input and $15/1M output tokens on the cheapest tracked provider, while Claude Sonnet 4.5 lists tiered pricing: 0-200,001t is $3/1M input and $15/1M output; 200,001t+ is $6/1M input and $22.50/1M output. A 70/30 input-output blend is tied on the cheapest tracked routes. For tiered rows, this cheapest-track view can understate interactive or fast-lane spend, so compare the tier you will actually use. Availability is 6 providers versus 8, so concentration risk also matters.
Choose Claude 3.7 Sonnet when coding workflow support are central to the workload. Choose Claude Sonnet 4.5 when vision-heavy evaluation and broader provider choice are more important. For production, rerun your own prompts through the exact provider, region, and tool stack you plan to ship.
FAQ
Which has a larger context window, Claude 3.7 Sonnet or Claude Sonnet 4.5?
Claude 3.7 Sonnet supports 200k tokens, while Claude Sonnet 4.5 supports 200k tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible.
Which is cheaper, Claude 3.7 Sonnet or Claude Sonnet 4.5?
Neither is cheaper on tracked token pricing. Both list $3/1M input and $15/1M output tokens on the cheapest tracked route. Provider discounts, batch pricing, or route-specific tiers can still change the final bill.
Is Claude 3.7 Sonnet or Claude Sonnet 4.5 open source?
Claude 3.7 Sonnet is listed under Proprietary. Claude Sonnet 4.5 is listed under Proprietary. License labels affect whether you can self-host, redistribute weights, or rely only on hosted APIs, so confirm the upstream license before deployment.
Which is better for vision, Claude 3.7 Sonnet or Claude Sonnet 4.5?
Both Claude 3.7 Sonnet and Claude Sonnet 4.5 expose vision. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.
Which is better for multimodal input, Claude 3.7 Sonnet or Claude Sonnet 4.5?
Both Claude 3.7 Sonnet and Claude Sonnet 4.5 expose multimodal input. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.
Where can I run Claude 3.7 Sonnet and Claude Sonnet 4.5?
Claude 3.7 Sonnet is available on Snowflake Cortex, GCP Vertex AI, Replicate API, OpenRouter, and AWS Bedrock. Claude Sonnet 4.5 is available on Microsoft Foundry, Anthropic, Snowflake Cortex, GCP Vertex AI, and AWS Bedrock. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
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Last reviewed: 2026-05-22. Data sourced from public model cards and provider documentation.