Claude Sonnet 4.5 vs DeepSeek V3.2
Benchmarks, API pricing and specs, head to head. Data updated 2026-06-10.
Anthropic · Sep 2025
The model that made 30-hour autonomous coding sessions real — 77.2% SWE-bench Verified and a 1M-token context beta at $3/$15.
DeepSeek · Sep 2025
The sparse-attention release that halved DeepSeek's already-lowest-in-class prices while keeping GPT-class quality.
The verdict
Claude Sonnet 4.5 and DeepSeek V3.2 split the 4 benchmarks they share evenly (2–2), so capability alone won't settle this one. On price the gap is dramatic: DeepSeek V3.2 works out roughly 19x cheaper per blended million tokens. Claude Sonnet 4.5 also takes 200K of context versus 128K for DeepSeek V3.2. And DeepSeek V3.2 is open-weights (MIT), so it can be self-hosted — a structural advantage if data control or vendor independence matters.
Benchmark head-to-head 2–2
Specs & pricing
| Claude Sonnet 4.5 | DeepSeek V3.2 | |
|---|---|---|
| modhub Index | 65.5 | 68.4 |
| Input price / 1M | $3 | $0.28 |
| Output price / 1M | $15 | $0.42 |
| Context window | 200K | 128K |
| Max output | 64K | 64K |
| Open weights | no | yes (MIT) |
| Reasoning model | yes | yes |
| Multimodal input | text, image | text |
| Knowledge cutoff | Jan 2025 | Jul 2025 |
| Released | Sep 2025 | Sep 2025 |
| Example monthly cost* | $52.50 | $3.43 |
* 10M input + 1.5M output tokens per month at list prices, no caching. Green = better value on that row.
Frequently asked questions
- Which is better, Claude Sonnet 4.5 or DeepSeek V3.2?
- Claude Sonnet 4.5 and DeepSeek V3.2 split the 4 benchmarks they share evenly (2–2), so capability alone won't settle this one. On price the gap is dramatic: DeepSeek V3.2 works out roughly 19x cheaper per blended million tokens. Claude Sonnet 4.5 also takes 200K of context versus 128K for DeepSeek V3.2. And DeepSeek V3.2 is open-weights (MIT), so it can be self-hosted — a structural advantage if data control or vendor independence matters.
- Which is cheaper, Claude Sonnet 4.5 or DeepSeek V3.2?
- Claude Sonnet 4.5 costs $3/$15 per million input/output tokens, while DeepSeek V3.2 costs $0.28/$0.42. For a typical workload of 10M input and 1.5M output tokens per month, that's $52.50 versus $3.43.
- Which model is better for coding, Claude Sonnet 4.5 or DeepSeek V3.2?
- On SWE-bench Verified — the standard agentic-coding benchmark — Claude Sonnet 4.5 scores 77.2% versus 67.8% for DeepSeek V3.2, making Claude Sonnet 4.5 the stronger pick for coding agents.