DeepSeek-V3.1-Terminus vs GPT-5.6 Sol
DeepSeek-V3.1-Terminus (DeepSeek) and GPT-5.6 Sol (OpenAI) compared on benchmarks, pricing, context window, and use-case rankings.
- DeepSeek-V3.1-Terminus is cheaper on input tokens — $0.27 vs $5.00 per 1M.
- GPT-5.6 Sol has a larger context window (1.1M vs 164K tokens).
- GPT-5.6 Sol ranks higher for coding (95th vs 45th percentile).
| Attribute | DeepSeek-V3.1-Terminus | GPT-5.6 Sol |
|---|---|---|
| Scores | ||
| Intelligence (ECI) | — | 162 |
| Coding | 45 | 95 |
| Math | 49 | 97 |
| Reasoning & Knowledge | 41 | 95 |
| Agentic & Tools | 13 | 66 |
| Specifications | ||
| Developer | DeepSeek | OpenAI |
| Family | DeepSeek | GPT |
| Released | Sep 22, 2025 | Jul 9, 2026 |
| Parameters | — | — |
| Availability | Open weights (unrestricted) | API access |
| Context window | 164K | 1.1M |
| Price — $/M input | $0.27 | $5.00 |
| Price — $/M output | $1.00 | $30.00 |
| Inputs | text | file, image, text |
| Outputs | text | text |
| Benchmarks | ||
| AIME 2024/2025 | 90% | 100% |
| GPQA Diamond | 79% | 93% |
| Humanity's Last Exam | 15% | 47% |
| LiveCodeBench | 80% | — |
| MMLU-Pro | 85% | — |
| SciCode | 41% | 56% |
| τ²-bench | 37% | 85% |
| APEX | — | 40% |
| ARC-AGI | — | 98% |
| ARC-AGI-2 | — | 93% |
| SimpleBench | — | 72% |
| SimpleQA Verified | — | 72% |
| WebDev Arena | — | 1620 |
| WeirdML | — | 89% |
Use-case scores are 0–100 percentile composites across each area’s benchmarks, ranked against every model from the past year. Highlighted cells lead each row. Open a model for the full picture.
Frequently asked questions
Which is cheaper, DeepSeek-V3.1-Terminus or GPT-5.6 Sol?
DeepSeek-V3.1-Terminus is cheaper on input tokens at $0.27 per million, versus $5.00 (representative OpenRouter pricing).
Which has a larger context window, DeepSeek-V3.1-Terminus or GPT-5.6 Sol?
GPT-5.6 Sol supports up to 1.1M tokens, compared with 164K for the other.
Which is better for coding, DeepSeek-V3.1-Terminus or GPT-5.6 Sol?
Across coding benchmarks like SWE-bench Verified and Terminal-Bench, GPT-5.6 Sol ranks higher — 95th vs 45th percentile among the models tracked on Model Beat.
Want a different match-up? Open the compare tool to add or swap models.
More comparisons
Benchmarks & model data from Epoch AI (CC BY); pricing & specs from OpenRouter. ECI = Epoch Capabilities Index.