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DeepSeek V4.1 Flash 1017 vs Claude Opus 5.5

At a glance

DeepSeek's October 2026 checkpoint of the V4.1 Flash workhorse, refreshed for stronger agentic coding with shorter, faster answers.

1.0M ctx$0.15/$0.60 per M

Anthropic's new flagship for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5.

1M ctx$4.00/$20.00 per M
Demos
All demos

No shared demos for these models yet.

AI Output
All AI outputs

No captured outputs for these models yet.

Benchmarks
See rankings
Reasoning
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:OpenRouter
Cheaper97%
Reasoning & Knowledge
Graduate Science—Factual Recall—
Math
Competition Math—
Agentic
Novel Reasoning—
Reasoning
CodingInsufficient data
AgenticInsufficient data
Sources:Epoch AI·OpenRouter· as of 2026-10-02
Reasoning & Knowledge
Graduate Science90.6%Factual Recall72.2%
Math
Competition Math100.0%
Agentic
Novel Reasoning92.5%
Specs
1.0M
Context
256K
Max output
Oct 2026
Released
1M
Context
128K
Max output
Sep 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input96%$0.15/M tokens
Output97%$0.60/M tokens
Cache read99%$0.003/M tokens
Live pricing, shown before you run
Input$4.00/M tokens
Output$20.00/M tokens
Cache read$0.20/M tokens
Cache write$5.00/M tokens
Web search$0.01/search
Chat with DeepSeek V4.1 Flash 1017Go to model
Chat with Claude Opus 5.5Go to model
Frequently Asked Questions: DeepSeek V4.1 Flash 1017 vs Claude Opus 5.5▼

Which is better, DeepSeek V4.1 Flash 1017 or Claude Opus 5.5?

▼

Both DeepSeek V4.1 Flash 1017 and Claude Opus 5.5 are capable AI models. The best choice depends on your specific use case: consider pricing, context window, speed, and which capabilities (vision, reasoning, audio) you need.

Which is cheaper, DeepSeek V4.1 Flash 1017 or Claude Opus 5.5?

▼

DeepSeek V4.1 Flash 1017 has a lower blended cost. DeepSeek V4.1 Flash 1017: $0.15 input / $0.60 output. Claude Opus 5.5: $4.00 input / $20.00 output.

Which has a larger context window, DeepSeek V4.1 Flash 1017 or Claude Opus 5.5?

▼

DeepSeek V4.1 Flash 1017 has a larger context window: DeepSeek V4.1 Flash 1017 supports 1M tokens vs Claude Opus 5.5 at 1M tokens.

Do both DeepSeek V4.1 Flash 1017 and Claude Opus 5.5 support vision?

▼

Yes, both DeepSeek V4.1 Flash 1017 and Claude Opus 5.5 support vision/image input.

What are the key differences between DeepSeek V4.1 Flash 1017 and Claude Opus 5.5?

▼

Key differences: DeepSeek V4.1 Flash 1017 is significantly cheaper. Compare full specs on this page.

Which model should I choose for my use case?

▼

If cost is your priority, choose the cheaper option. If you need the highest intelligence for complex tasks, pick the higher-scoring model. For long documents or codebases, choose the larger context window. You can try both DeepSeek V4.1 Flash 1017 and Claude Opus 5.5 for free on idapt.app to see which performs better for your specific needs.

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