Claude Opus 5.5 vs DeepSeek V3.1 Terminus
Price, context window & benchmark comparison
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Verdict: DeepSeek V3.1 Terminus is 17.7× cheaper than Claude Opus 5.5 on a typical 3:1 input/output mix. Claude Opus 5.5 scores higher on the Artificial Analysis Intelligence Index (57.6 vs 14.8). Claude Opus 5.5 has the larger context window (1M vs 164K).
| Claude Opus 5.5 | DeepSeek V3.1 Terminus | |
|---|---|---|
| Input price / 1M | $4.00 | $0.27 |
| Output price / 1M | $20.00 | $1.00 |
| Blended price (3:1) | $8.00 | $0.45 |
| Cached input / 1M | $0.20 | $0.14 |
| Context window | 1M | 164K |
| Max output | 128K | 33K |
| Intelligence index | 57.6 | 14.8 |
| Coding index | — | 43.5 |
| Providers | 11 | — |
| Best provider uptime (30m) | 100.0% | — |
| Vision input | Yes | No |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| Released | 2026-09-22 | 2025-09-22 |
| Retirement | — | 2026-09-28 |
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FAQ
Which is cheaper, Claude Opus 5.5 or DeepSeek V3.1 Terminus?
DeepSeek V3.1 Terminus is 17.7× cheaper than Claude Opus 5.5 on a typical 3:1 input/output mix.
Claude Opus 5.5 vs DeepSeek V3.1 Terminus: which has a bigger context window?
Claude Opus 5.5: 1,000,000 tokens. DeepSeek V3.1 Terminus: 163,840 tokens.
How much would 1 million requests cost?
At 2,000 input + 500 output tokens per request: Claude Opus 5.5 ≈ $18,000, DeepSeek V3.1 Terminus ≈ $1,040.
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