Claude Sonnet 4.5 vs DeepSeek V4 Pro
Claude Sonnet 4.5 (2025) and DeepSeek V4 Pro (2026) are frontier-tier reasoning models from Anthropic and DeepSeek. Claude Sonnet 4.5 ships a 200K-token context window, while DeepSeek V4 Pro ships a 1M-token context window. On MMLU PRO, DeepSeek V4 Pro leads by 1.5 pts. This comparison covers specs, pricing, capabilities, benchmarks, provider availability, and production fit. It focuses on practical selection signals rather than broad model-family marketing.
DeepSeek V4 Pro fits 5x more tokens; pick it for long-context work and Claude Sonnet 4.5 for tighter calls.
Specs
| Released | 2025-09-29 | 2026-04-24 |
| Context window | 200K | 1M |
| Parameters | — | 1.6T |
| Architecture | decoder only | mixture of experts |
| License | Proprietary | MIT |
| Knowledge cutoff | 2025-12 | - |
Pricing and availability
| Claude Sonnet 4.5 | DeepSeek V4 Pro | |
|---|---|---|
| Input price | $3/1M tokens | - |
| Output price | $15/1M tokens | - |
| Providers | - |
Capabilities
| Claude Sonnet 4.5 | DeepSeek V4 Pro | |
|---|---|---|
| Vision | ||
| Multimodal | ||
| Reasoning | ||
| Function calling | ||
| Tool use | ||
| Structured outputs | ||
| Code execution |
Benchmarks
| Benchmark | Claude Sonnet 4.5 | DeepSeek V4 Pro |
|---|---|---|
| MMLU PRO | 86.0 | 87.5 |
Deep dive
On shared benchmark coverage, MMLU PRO has Claude Sonnet 4.5 at 86 and DeepSeek V4 Pro at 87.5, with DeepSeek V4 Pro ahead by 1.5 points. The largest visible gap is 1.5 points on MMLU PRO, 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 vision: Claude Sonnet 4.5 and multimodal input: Claude Sonnet 4.5. Both models share reasoning mode, function calling, tool use, and structured outputs, 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.
Pricing coverage is uneven: Claude Sonnet 4.5 has $3/1M input tokens and DeepSeek V4 Pro has no token price sourced yet. Provider availability is 8 tracked routes versus 0. Treat unknown pricing as an integration gap, then verify the route you will actually call before estimating production spend.
Choose Claude Sonnet 4.5 when vision-heavy evaluation and broader provider choice are central to the workload. Choose DeepSeek V4 Pro when long-context analysis and larger context windows 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 Sonnet 4.5 or DeepSeek V4 Pro?
DeepSeek V4 Pro supports 1M 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.
Is Claude Sonnet 4.5 or DeepSeek V4 Pro open source?
Claude Sonnet 4.5 is listed under Proprietary. DeepSeek V4 Pro is listed under MIT. 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 Sonnet 4.5 or DeepSeek V4 Pro?
Claude Sonnet 4.5 has the clearer documented vision signal in this comparison. If vision is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Which is better for multimodal input, Claude Sonnet 4.5 or DeepSeek V4 Pro?
Claude Sonnet 4.5 has the clearer documented multimodal input signal in this comparison. If multimodal input is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Which is better for reasoning mode, Claude Sonnet 4.5 or DeepSeek V4 Pro?
Both Claude Sonnet 4.5 and DeepSeek V4 Pro expose reasoning mode. 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 Sonnet 4.5 and DeepSeek V4 Pro?
Claude Sonnet 4.5 is available on Microsoft Foundry, Anthropic, Snowflake Cortex, GCP Vertex AI, and AWS Bedrock. DeepSeek V4 Pro is available on the tracked providers still being sourced. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
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Last reviewed: 2026-04-24. Data sourced from public model cards and provider documentation.