AI model comparison
DeepSeek V4.1 Flash 1017 vs Claude Opus 5.5
Pricing, context window, benchmarks, and features compared side by side. Or skip the guesswork and send one prompt to both.
DeepSeek V4.1 Flash 1017 is the October 17, 2026 snapshot of DeepSeek V4.1 Flash, served by DeepSeek under the `deepseek-flash` API model name.
- Input / 1M
- $0.15
- Output / 1M
- $0.60
- Context
- 1.05M
Claude Opus 5.5 is Anthropic's flagship model for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5.
- Input / 1M
- $4
- Output / 1M
- $20
- Context
- 1M
Comparing image generators? Compare image models
At a glance
Quick verdict
How the two models stack up on the things people ask about most.
Lower price
DeepSeek V4.1 Flash 1017
30.0x cheaper for a typical chat
Higher intelligence score
Claude Opus 5.5
57.6 vs 39.5 on Artificial Analysis
Larger context window
DeepSeek V4.1 Flash 1017
1.05M vs 1M tokens
Newer release
DeepSeek V4.1 Flash 1017
Released October 17, 2026
Benchmarks
Benchmark scores
Independent scores from Artificial Analysis. Higher is better.
Intelligence index
DeepSeek V4.1 Flash 101739.5Claude Opus 5.557.6Coding index
DeepSeek V4.1 Flash 1017Not availableClaude Opus 5.5Not availableAgentic index
DeepSeek V4.1 Flash 1017Not availableClaude Opus 5.5Not availablePricing
DeepSeek V4.1 Flash 1017 vs Claude Opus 5.5 API pricing
Per-token API rates. Cheaper option highlighted.
| Metric | DeepSeek V4.1 Flash 1017 | Claude Opus 5.5 |
|---|---|---|
| Input tokensPer 1M tokens | $0.15 | $4 |
| Output tokensPer 1M tokens | $0.60 | $20 |
| Cached input (read)Per 1M tokens | $0.00 | $0.20 |
| Cache writePer 1M tokens | Not available | $5 |
| Web searchPer request | Not available | $0.01 |
What it costs in practice
Estimated cost per 1,000 requests at standard rates. Coding and long-document figures also show the cost when the input is already cached.
Chat message
2K in, 500 out
DeepSeek V4.1 Flash 1017$0.60Claude Opus 5.5$18Coding task
30K in, 4K out
DeepSeek V4.1 Flash 1017$6.90$2.49 cachedClaude Opus 5.5$200$86 cachedLong document summary
150K in, 2K out
DeepSeek V4.1 Flash 1017$23.70$1.65 cachedClaude Opus 5.5$640$70 cachedSpecs
Context window and capabilities
How much each model can read, how much it can write, and what it accepts as input.
| Metric | DeepSeek V4.1 Flash 1017 | Claude Opus 5.5 |
|---|---|---|
| Context window | 1.05M tokens | 1M tokens |
| Max output | 393K tokens | 128K tokens |
| Input types | Image, Text | File, Image, Text |
| Output types | Text | Text |
| Reasoning effort levels | Max, High, Low, None | Max, Extra high, High, Medium, Low |
| Default reasoning effort | High | High |
| Release date | October 17, 2026 | September 22, 2026 |
Features
Supported features
API features available for each model.
| Metric | DeepSeek V4.1 Flash 1017 | Claude Opus 5.5 |
|---|---|---|
| Tool calling | Supported | Supported |
| Structured outputs | Supported | Supported |
| JSON mode | Supported | Supported |
| Reasoning | Supported | Supported |
| Temperature | Supported | Not supported |
| Stop sequences | Supported | Supported |
| Deterministic seed | Supported | Not supported |
| Verbosity control | Not supported | Supported |
Keep exploring
More on these models
Other head-to-heads, the full model page, and the alternatives list for each model.
DeepSeek V4.1 Flash 1017View full model details- DeepSeek V4.1 Flash 1017 vs DeepSeek V4.1 Flash
- DeepSeek V4.1 Flash 1017 vs GLM 5.3 Flash
- DeepSeek V4.1 Flash 1017 vs Step 5 Preview
- DeepSeek V4.1 Flash 1017 vs MiMo-V2.6-Flash
- DeepSeek V4.1 Flash 1017 vs Hy4 preview
- DeepSeek V4.1 Flash 1017 vs GPT-6 Luna
- DeepSeek V4.1 Flash 1017 vs GLM 5.3
- DeepSeek V4.1 Flash 1017 vs DeepSeek V4 Flash 0731
- DeepSeek V4.1 Flash 1017 vs Muse Spark 1.3 Contributor
- DeepSeek V4.1 Flash 1017 vs Hy3
- DeepSeek V4.1 Flash 1017 vs Claude Haiku 5.5
- DeepSeek V4.1 Flash 1017 vs Gemini 3.8 Flash
- DeepSeek V4.1 Flash 1017 vs MiMo-V2.6-Pro
- DeepSeek V4.1 Flash 1017 vs GPT-5.6 Luna
- DeepSeek V4.1 Flash 1017 vs DeepSeek V4 Pro 0813
- DeepSeek V4.1 Flash 1017 vs DeepSeek V4 Pro 0423
- DeepSeek V4.1 Flash 1017 vs Qwen3.8 Flash
- DeepSeek V4.1 Flash 1017 vs Ling 3.1 Flash
- DeepSeek V4.1 Flash 1017 vs Gemini 3.7 Flash
- DeepSeek V4.1 Flash 1017 vs Qwen3.8 2.4T A95B
- DeepSeek V4.1 Flash 1017 vs Muse Spark 1.2
- DeepSeek V4.1 Flash 1017 vs GPT-6 Luna Pro
- DeepSeek V4.1 Flash 1017 vs Mistral Large 4
- DeepSeek V4.1 Flash 1017 vs DeepSeek V4 Flash Vision Exp
- DeepSeek V4.1 Flash 1017 vs GLM 5.3 FlashX
- DeepSeek V4.1 Flash 1017 vs GPT-5.6 Luna Pro
Claude Opus 5.5View full model details- Claude Opus 5.5 vs Claude Sonnet 5.5
- Claude Opus 5.5 vs Claude Fable 5.1
- Claude Opus 5.5 vs GPT-6 Astra
- Claude Opus 5.5 vs Gemini 4 Argon
- Claude Opus 5.5 vs DeepSeek V4.1 Flash
- Claude Opus 5.5 vs GPT-6.1 Sol
- Claude Opus 5.5 vs GLM 5.3 Flash
- Claude Opus 5.5 vs Claude Opus 5
- Claude Opus 5.5 vs Step 5 Preview
- Claude Opus 5.5 vs Claude Fable 5
- Claude Opus 5.5 vs MiMo-V2.6-Flash
- Claude Opus 5.5 vs Muse Spark 1.3
- Claude Opus 5.5 vs Hy4 preview
- Claude Opus 5.5 vs GPT-6 Sol
- Claude Opus 5.5 vs GPT-5.6 Sol
- Claude Opus 5.5 vs GPT-6 Luna
- Claude Opus 5.5 vs Grok 4.7
- Claude Opus 5.5 vs GLM 5.3
- Claude Opus 5.5 vs DeepSeek V4 Flash 0731
- Claude Opus 5.5 vs Muse Spark 1.3 Contributor
- Claude Opus 5.5 vs Hy3
- Claude Opus 5.5 vs Kimi K3
- Claude Opus 5.5 vs Gemini 3.1 Pro Preview
Our take
DeepSeek V4.1 Flash 1017 is 30.0x cheaper for a typical chat. Claude Opus 5.5 scores higher on the Artificial Analysis Intelligence Index (57.6 vs 39.5). DeepSeek V4.1 Flash 1017 has the larger context window (1.05M vs 1M tokens). The right pick depends on your workload, so the quickest way to settle it is to send the same prompt to both and compare.
FAQ
Frequently asked questions
Is DeepSeek V4.1 Flash 1017 or Claude Opus 5.5 cheaper?
DeepSeek V4.1 Flash 1017 is cheaper for a typical chat (2K input tokens and 500 output tokens). DeepSeek V4.1 Flash 1017 costs $0.15 per 1M input tokens and $0.60 per 1M output tokens, while Claude Opus 5.5 costs $4 per 1M input tokens and $20 per 1M output tokens.
Which has a bigger context window, DeepSeek V4.1 Flash 1017 or Claude Opus 5.5?
DeepSeek V4.1 Flash 1017 supports up to 1.05M tokens of context, compared with 1M for Claude Opus 5.5.
Is DeepSeek V4.1 Flash 1017 smarter than Claude Opus 5.5?
On the Artificial Analysis Intelligence Index, DeepSeek V4.1 Flash 1017 scores 39.5 and Claude Opus 5.5 scores 57.6, putting Claude Opus 5.5 ahead. Benchmarks don't capture everything, so the best test is running your own prompts through both.
Can I use DeepSeek V4.1 Flash 1017 and Claude Opus 5.5 at the same time?
Yes. Shortcut Chat sends one prompt to multiple models at once, so you can see DeepSeek V4.1 Flash 1017 and Claude Opus 5.5 answer side by side and keep the better response.
Why choose? Ask both.
Send one prompt to DeepSeek V4.1 Flash 1017 and Claude Opus 5.5 at the same time. Compare the answers side by side and keep the best one.