Claude 3.7 Sonnet vs Gemini 2.5 Flash
Claude 3.7 Sonnet (2024) and Gemini 2.5 Flash (2025) are frontier reasoning models from Anthropic and Google DeepMind. Claude 3.7 Sonnet ships a 200k-token context window, while Gemini 2.5 Flash ships a 1m-token context window. On MMLU PRO, Gemini 2.5 Flash leads by 8.1 pts. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.
Gemini 2.5 Flash is ~900% cheaper at $0.30/1M; pay for Claude 3.7 Sonnet only for coding workflow support.
Decision scorecard
Local evidence first| Signal | Claude 3.7 Sonnet | Gemini 2.5 Flash |
|---|---|---|
| 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 | $15/1M tokens | $2.50/1M tokens |
| Provider routes | 6 tracked | 6 tracked |
| Shared benchmarks | 5 shared | MMLU PRO leader |
Decision tradeoffs
- Claude 3.7 Sonnet holds a shared-benchmark lead on HumanEval, ahead by 2.9 points.
- Claude 3.7 Sonnet uniquely exposes Reasoning in local model data.
- Local decision data tags Claude 3.7 Sonnet for Coding, RAG, and Agents.
- Gemini 2.5 Flash holds a shared-benchmark lead on MMLU PRO, ahead by 8.1 points.
- Gemini 2.5 Flash has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Gemini 2.5 Flash has the lower cheapest tracked output price at $2.50/1M tokens.
- Local decision data tags Gemini 2.5 Flash 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
Gemini 2.5 Flash
$865
Cheapest tracked route/tier: Google AI Studio
Estimated monthly gap: $5,285. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on GCP Vertex AI, Replicate API, and OpenRouter; start route-level A/B tests there.
- Gemini 2.5 Flash is $12.50/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for Reasoning before moving production traffic.
- Provider overlap exists on GCP Vertex AI, Replicate API, and OpenRouter; start route-level A/B tests there.
- Claude 3.7 Sonnet is $12.50/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Claude 3.7 Sonnet adds Reasoning in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2024-03-04 | 2025-06-17 |
| 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 | 2024-11 | 2025-01 |
Pricing and availability
| Pricing attribute | Claude 3.7 Sonnet | Gemini 2.5 Flash |
|---|---|---|
| Input price | $3/1M tokens | $0.30/1M tokens |
| Output price | $15/1M tokens | $2.50/1M tokens |
| Providers |
Capabilities
| Capability | Claude 3.7 Sonnet | Gemini 2.5 Flash |
|---|---|---|
| Vision | Yes | Yes |
| Multimodal | Yes | Yes |
| Reasoning | Yes | No |
| 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 3.7 Sonnet | Gemini 2.5 Flash |
|---|---|---|
| MMLU PRO | 80.3 | 88.4 |
| LiveCodeBench | 68.9 | 76.2 |
| Massive Multi-discipline Multimodal Understanding | 75.0 | 79.7 |
| HumanEval | 93.0 | 90.1 |
| Aider Polyglot | 64.9 | 55.1 |
Continue comparing
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- Claude 3.7 Sonnet vs Qwen3-Max
- Claude Sonnet 4.6 vs Gemini 2.5 Flash
- Gemini 2.5 Flash vs Gemini 2.5 Pro
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Last reviewed: 2026-07-26. Data sourced from public model cards and provider documentation.