DeepSeek V4 Pro vs Claude Sonnet 5.5
Claude Sonnet 5.5 comes out ahead, 46 to 39 on our weighted score, though DeepSeek V4 Pro is 2× cheaper per token.
DeepSeekDeepSeek V4 Pro
39/100- ECI—
- Price$1.60 / $3.30
- Context1M
- Our pick
AnthropicClaude Sonnet 5.5
46/100- ECI166.7
- Price$2.00 / $10.00
- Context1M
Add a model
Make it a three-way comparison.
Claude Sonnet 5.5 is our pick
Claude Sonnet 5.5 is the better all-round choice, scoring 46/100 against DeepSeek V4 Pro (39). It leads on inputs & features. DeepSeek V4 Pro wins on price. The score weighs price 50%, inputs & features 30%, context window 20%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.
- CapabilityNot enough dataNo independent benchmark covers every model here yet
- Lowest priceDeepSeek V4 ProDeepSeek V4 Pro $2.03 · Claude Sonnet 5.5 $4.00 per 1M tokens (3:1 blend)
- Longest contextAbout the sameDeepSeek V4 Pro 1,000,000 · Claude Sonnet 5.5 1,000,000 tokens
- Widest inputsClaude Sonnet 5.5DeepSeek V4 Pro: Text · Claude Sonnet 5.5: Text, Images, PDFs
- Self-hostingDeepSeek V4 ProPublishes downloadable weights
| Measure | Weight | DeepSeek V4 Pro | Claude Sonnet 5.5 |
|---|---|---|---|
| Price | 50% | 34 | 20 |
| Inputs & features | 30% | 35 | 80 |
| Context window | 20% | 60 | 60 |
| Overall | 100% | 39/100 | 46/100 |
Left out because at least one model lacks the data: capability. The remaining weights were rescaled.
Every spec in one table
Highlighted cells lead their row. Dashes mean the data is not published.
| Specification | DeepSeek V4 ProDeepSeek | Claude Sonnet 5.5Anthropic |
|---|---|---|
| Capability | ||
| Capabilities Index (ECI) | — | 166.7 |
| ECI rank | — | #5 of 165 |
| GPQA DiamondGraduate-level science questions | — | 95.6% |
| FrontierMath Tiers 1–3Research-level mathematics | — | 88.8% |
| OTIS Mock AIME 2024–2025Competition mathematics | — | 100% |
| SimpleQA VerifiedShort factual questions | — | 46.5% |
| Price per million tokens | ||
| Input | $1.60 (best) | $2.00 |
| Output | $3.30 (best) | $10.00 |
| Cached input | — | $0.10 |
| Blended (3:1) | $2.03 (best) | $4.00 |
| Long-context rate | Same rate | Same rate |
| Price source | Median of 56 providers | Official Anthropic API |
| Limits | ||
| Context window | 1,000,000 tokens | 1,000,000 tokens |
| Max output | 384,000 tokens (best) | 128,000 tokens |
| Inputs and features | ||
| Text | Yes | Yes |
| Images | No | Yes |
| PDFs | No | Yes |
| Audio | No | No |
| Video | No | No |
| Reasoning | Yes | Yeslow · medium · high · xhigh · max |
| Tool calling | Yes | Yes |
| Structured output | No | Yes |
| Availability | ||
| Weights | Open | Proprietary |
| API model ID | — | claude-sonnet-5-5 |
| API providers | 58 (best) | 34 |
| Released | Apr 24, 2026 | Sep 28, 2026 |
| Knowledge cutoff | May 2025 | Jun 2026 |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- DeepSeek V4 Pro$22.60
- Claude Sonnet 5.5$40.00
Which should you choose?
Which is better: DeepSeek V4 Pro or Claude Sonnet 5.5?
Claude Sonnet 5.5 is the better all-round choice, scoring 46/100 against DeepSeek V4 Pro (39). It leads on inputs & features. DeepSeek V4 Pro wins on price. The score weighs price 50%, inputs & features 30%, context window 20%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.
Which is cheaper, DeepSeek V4 Pro or Claude Sonnet 5.5?
DeepSeek V4 Pro is cheaper at $1.60 input / $3.30 output per million tokens (median across 56 API providers). Claude Sonnet 5.5 costs $2.00 input / $10.00 output per million tokens (official Anthropic API price). At a typical mix of three input tokens to one output token, that is $2.03 per million tokens for DeepSeek V4 Pro versus $4.00 for Claude Sonnet 5.5 (2× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers both models yet. DeepSeek V4 Pro has not been scored yet and Claude Sonnet 5.5 has an ECI of 166.7.
Which is better for coding?
There are no published SWE-bench Verified results for DeepSeek V4 Pro and Claude Sonnet 5.5 yet, so there is no like-for-like coding score. Test both on a sample of your own tasks. Both support tool calling for agent workflows.
Which has the bigger context window?
DeepSeek V4 Pro and Claude Sonnet 5.5 share the same 1,000,000-token context window. Maximum output per response: DeepSeek V4 Pro up to 384,000, Claude Sonnet 5.5 up to 128,000 tokens.
Which can read images, PDFs, audio or video?
DeepSeek V4 Pro accepts text; Claude Sonnet 5.5 accepts text, images and PDFs. Claude Sonnet 5.5 handles the widest range of inputs.
Are any of these open source?
DeepSeek V4 Pro publishes its weights and can be self-hosted; Claude Sonnet 5.5 is proprietary.
Which is newer?
Claude Sonnet 5.5 is the newest, released Sep 28, 2026. DeepSeek V4 Pro came out Apr 24, 2026. Knowledge cutoff: DeepSeek V4 Pro May 2025, Claude Sonnet 5.5 Jun 2026.
How do you decide the winner?
Each model gets a 0–100 score on capability (50%, independent benchmark results); price (25%, blended price per million tokens (3 input : 1 output), log scale); inputs & features (15%, image, PDF, audio and video input, tool calling, structured output and reasoning); context window (10%, maximum tokens per request, log scale). Dimensions missing for any model are dropped and the remaining weights rescaled, so every model is judged on the same evidence. Specs and prices come from public model listings and the labs’ own API pages; capability scores come from independent benchmark runs. Data updated Nov 2, 2026.
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