Claude Opus 5.5 vs DeepSeek V4 Pro
DeepSeek V4 Pro costs a fraction of Claude Opus 5.5: $0.66 input and $1.98 output per 1M tokens against $4 and $20, so our feature session comes to $3.41 instead of $21.60. Its weights are open, so you can also run it yourself. We have no benchmark score for DeepSeek V4 Pro to compare with those for Opus 5.5.
Price
Opus 5.5 costs 6.3 times as much in our feature session. With 90% of prompts cached it is $0.65 on DeepSeek V4 Pro against $5.18, and a long agent day is $31.18 against $195. One dollar buys 1.52M input tokens on DeepSeek and 250K on Opus.
What DeepSeek V4 Pro reads and writes
DeepSeek V4 Pro reads text only, up to 1.05M tokens, and writes up to 393K tokens in one reply. Opus 5.5 reads text and images, up to 1M tokens, and writes up to 128K. If your agent passes screenshots, only Opus will read them.
Before you choose
Opus 5.5 scored 66.4% on Terminal-Bench 4.0 at xhigh effort, 54.4% on FrontierCode 1.1 and 67.7% on Humanity's Last Exam with tools. We found no DeepSeek V4 Pro score on any of the three, so test it on your own tasks before you rely on it.
DeepSeek V4 Pro was first listed on the API on 12 August 2026; Anthropic released Opus 5.5 six weeks later, on 22 September. The token cost calculator prices your own mix of calls on both.
Side by side
| Claude Opus 5.5 | DeepSeek V4 Pro | |
|---|---|---|
| Maker | Anthropic | DeepSeek |
| Released | 22 September 2026[1] | 12 August 2026[2] first API listing |
| Context window | 1M tokens[1] | 1.05M tokens[3] As served by the price's provider on OpenRouter. |
| Max output | 128K tokens[1] | 393K tokens[3] As served by the price's provider on OpenRouter. |
| Input price | $4 per 1M tokens[1] | $0.66 per 1M tokens[3] |
| Output price | $20 per 1M tokens[1] | $1.98 per 1M tokens[3] |
| Cached input | $0.20 per 1M tokens[4] | $0.022 per 1M tokens[3] |
| Long prompts | One price | One price |
| Price change | None announced | None announced |
| Open weights | No[1] Offered through the Claude API and cloud platforms; no weights are published. | Yes[5] MIT licence. |
| Reads | text, image[1] | text[2] |
Benchmarks
None of the benchmarks below has a published score for both models. We only show a score we can cite with its source and date; "Not published" means we found none for that model, not that it scored zero.
| Benchmark | Claude Opus 5.5 | DeepSeek V4 Pro |
|---|---|---|
| Terminal-Bench 4.0Agentic coding tasks in a real terminal. | 66.4%[6] Run at xhigh effort. | Not published |
| FrontierCode 1.1 (Main)Hard software engineering tasks. | 54.4%[6] Max effort. | Not published |
| Humanity's Last Exam (with tools)Expert-level questions across many fields, tools allowed. | 67.7%[6] | Not published |
What a coding session costs
Our own estimate from the list prices above, for three sessions we define: a coding agent resends the conversation with every call, so prompts are large and grow. "Cached" assumes 90% of prompt tokens are read from the prompt cache and leaves out cache write fees. A long-prompt price applies when a call's prompt is over its threshold. Work out your own mix with the token cost calculator.
| Session | Claude Opus 5.5 | Claude Opus 5.5 cached | DeepSeek V4 Pro | DeepSeek V4 Pro cached |
|---|---|---|---|---|
| Quick fix10 calls of 25K prompt and 1.5K output tokens | $1.30 | $0.45 | $0.19 | $0.05 |
| Feature session60 calls of 80K prompt and 2K output tokens | $21.60 | $5.18 | $3.41 | $0.65 |
| Long agent day300 calls of 150K prompt and 2.5K output tokens | $195 | $41.10 | $31.18 | $5.35 |
Value for money and release gap
Claude Opus 5.5 is dated 6 weeks later (41 days; DeepSeek V4 Pro: first API listing). Price per point divides our feature-session cost by a published score: lower means more score for the money. It is a rough lens, not a ranking.
| Measure | Claude Opus 5.5 | DeepSeek V4 Pro |
|---|---|---|
| Input tokens per $1 | 250K | 1.52M |
| Filling the whole context window once | $4.00 | $0.69 |
Questions
How much cheaper is DeepSeek V4 Pro than Claude Opus 5.5?
At list prices our feature session costs $3.41 on DeepSeek V4 Pro and $21.60 on Opus 5.5, so Opus costs 6.3 times as much. Per 1M tokens it is $0.66 against $4 input and $1.98 against $20 output.
Does DeepSeek V4 Pro have open weights?
Yes, according to the source we cite. The weights of Claude Opus 5.5 are not open.
Can DeepSeek V4 Pro read images?
Not by the source we cite: it reads text only. Claude Opus 5.5 reads text and images.
Most compared
Any other two models: pick them in the lists at the top of the page.
- Claude Opus 5.5 vs Claude Sonnet 5.5
- Claude Fable 5.1 vs Claude Opus 5.5
- Claude Opus 5 vs Claude Opus 5.5
- Claude Opus 5.5 vs GPT-6.1 Sol
- Claude Opus 5.5 vs GPT-5.6 Sol
- Claude Opus 5.5 vs GPT-6 Astra
- Claude Opus 5.5 vs Gemini 4 Argon
- Claude Opus 5.5 vs Gemini 3.1 Pro Preview
- Claude Opus 5.5 vs Grok 4.7
- Claude Sonnet 5 vs Claude Sonnet 5.5
- Claude Haiku 5.5 vs Claude Sonnet 5.5
- Claude Haiku 4.5 vs Claude Haiku 5.5
- Claude Fable 5 vs Claude Fable 5.1
- Claude Sonnet 5.5 vs GPT-6.1 Sol
- Claude Fable 5.1 vs GPT-6 Astra
- Claude Haiku 5.5 vs GPT-6 Luna
- GPT-6.1 Sol vs GPT-6 Sol
- GPT-6.1 Sol vs GPT-6 Astra
- Claude Sonnet 5.5 vs Gemini 4 Argon
- Gemini 4 Argon vs GPT-6.1 Sol
- Gemini 3.1 Pro Preview vs Gemini 4 Argon
- Claude Haiku 5.5 vs Gemini 3.8 Flash
- Claude Sonnet 5.5 vs Kimi K3
- Claude Sonnet 5.5 vs GLM-5.3
More tools
Sources
- platform.claude.com: docs/en/models/opus-5-5/overview, read
- openrouter.ai: deepseek/deepseek-v4-pro-0813, read
- openrouter.ai: deepseek/deepseek-v4-pro-0813/providers, read
- platform.claude.com: docs/en/about-claude/pricing, read
- huggingface.co: deepseek-ai/DeepSeek-V4-Pro-0813, read
- anthropic.com: claude-opus-5-5, read
Numbers from the makers' own pages, checked by hand, last read . List prices in US dollars before tax. Spotted a mistake? office@shuriken.sh.
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