DeepSeek V4 Pro vs Claude Sonnet 5.5 vs Gemini Robotics-ER 1.6 Preview
Too close to call on our weighted score (Claude Sonnet 5.5 46, Gemini Robotics-ER 1.6 Preview 46, DeepSeek V4 Pro 39). The right pick depends on what you value most.
DeepSeekDeepSeek V4 Pro
39/100- ECI—
- Price$1.60 / $3.30
- Context1M
AnthropicClaude Sonnet 5.5
46/100- ECI166.7
- Price$2.00 / $10.00
- Context1M
GoogleGemini Robotics-ER 1.6 Preview
46/100- ECI—
- Price$1.00 / $5.00
- Context131K
Too close to call
It is close. Our weighted score puts them within a point (Claude Sonnet 5.5 46/100, Gemini Robotics-ER 1.6 Preview 46/100, DeepSeek V4 Pro 39/100), so choose by what matters most for your work: Gemini Robotics-ER 1.6 Preview 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 priceGemini Robotics-ER 1.6 PreviewGemini Robotics-ER 1.6 Preview $2.00 · DeepSeek V4 Pro $2.03 · Claude Sonnet 5.5 $4.00 per 1M tokens (3:1 blend)
- Longest contextDeepSeek V4 Pro and Claude Sonnet 5.5DeepSeek V4 Pro 1,000,000 · Claude Sonnet 5.5 1,000,000 · Gemini Robotics-ER 1.6 Preview 131,072 tokens
- Widest inputsGemini Robotics-ER 1.6 PreviewDeepSeek V4 Pro: Text · Claude Sonnet 5.5: Text, Images, PDFs · Gemini Robotics-ER 1.6 Preview: Text, Images, Audio, Video
- Self-hostingDeepSeek V4 ProPublishes downloadable weights
| Measure | Weight | DeepSeek V4 Pro | Claude Sonnet 5.5 | Gemini Robotics-ER 1.6 Preview |
|---|---|---|---|---|
| Price | 50% | 34 | 20 | 34 |
| Inputs & features | 30% | 35 | 80 | 80 |
| Context window | 20% | 60 | 60 | 25 |
| Overall | 100% | 39/100 | 46/100 | 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 | Gemini Robotics-ER 1.6 PreviewGoogle |
|---|---|---|---|
| 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 | $2.00 | $1.00 (best) |
| Output | $3.30 (best) | $10.00 | $5.00 |
| Cached input | — | $0.10 | — |
| Blended (3:1) | $2.03 | $4.00 | $2.00 (best) |
| Long-context rate | Same rate | Same rate | Same rate |
| Price source | Median of 56 providers | Official Anthropic API | Median of 1 providers |
| Limits | |||
| Context window | 1,000,000 tokens (best) | 1,000,000 tokens (best) | 131,072 tokens |
| Max output | 384,000 tokens (best) | 128,000 tokens | 65,536 tokens |
| Inputs and features | |||
| Text | Yes | Yes | Yes |
| Images | No | Yes | Yes |
| PDFs | No | Yes | No |
| Audio | No | No | Yes |
| Video | No | No | Yes |
| Reasoning | Yes | Yeslow · medium · high · xhigh · max | Yes |
| Tool calling | Yes | Yes | Yes |
| Structured output | No | Yes | No |
| Availability | |||
| Weights | Open | Proprietary | Proprietary |
| API model ID | — | claude-sonnet-5-5 | — |
| API providers | 58 (best) | 34 | 1 |
| Released | Apr 24, 2026 | Sep 28, 2026 | Apr 14, 2026 |
| Knowledge cutoff | May 2025 | Jun 2026 | Jan 2025 |
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
- Gemini Robotics-ER 1.6 Preview$20.00
Which should you choose?
Which is better: DeepSeek V4 Pro, Claude Sonnet 5.5 or Gemini Robotics-ER 1.6 Preview?
It is close. Our weighted score puts them within a point (Claude Sonnet 5.5 46/100, Gemini Robotics-ER 1.6 Preview 46/100, DeepSeek V4 Pro 39/100), so choose by what matters most for your work: Gemini Robotics-ER 1.6 Preview 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, Claude Sonnet 5.5 or Gemini Robotics-ER 1.6 Preview?
Gemini Robotics-ER 1.6 Preview is cheaper at $1.00 input / $5.00 output per million tokens (median across 1 API provider). DeepSeek V4 Pro costs $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 $2.00 per million tokens for Gemini Robotics-ER 1.6 Preview versus $2.03 for DeepSeek V4 Pro (1× as much) and $4.00 for Claude Sonnet 5.5 (2× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers all three models yet. DeepSeek V4 Pro has not been scored yet, Claude Sonnet 5.5 has an ECI of 166.7 and Gemini Robotics-ER 1.6 Preview has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for DeepSeek V4 Pro, Claude Sonnet 5.5 and Gemini Robotics-ER 1.6 Preview yet, so there is no like-for-like coding score. Test both on a sample of your own tasks. All three support tool calling for agent workflows.
Which has the bigger context window?
DeepSeek V4 Pro and Claude Sonnet 5.5 have the largest context windows (1,000,000 and 1,000,000 tokens), against 131,072 for Gemini Robotics-ER 1.6 Preview. Maximum output per response: DeepSeek V4 Pro up to 384,000, Claude Sonnet 5.5 up to 128,000, Gemini Robotics-ER 1.6 Preview up to 65,536 tokens.
Which can read images, PDFs, audio or video?
DeepSeek V4 Pro accepts text; Claude Sonnet 5.5 accepts text, images and PDFs; Gemini Robotics-ER 1.6 Preview accepts text, images, audio and video. Gemini Robotics-ER 1.6 Preview 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 and Gemini Robotics-ER 1.6 Preview is proprietary.
Which is newer?
Claude Sonnet 5.5 is the newest, released Sep 28, 2026. DeepSeek V4 Pro came out Apr 24, 2026; Gemini Robotics-ER 1.6 Preview came out Apr 14, 2026. Knowledge cutoff: DeepSeek V4 Pro May 2025, Claude Sonnet 5.5 Jun 2026, Gemini Robotics-ER 1.6 Preview Jan 2025.
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.
