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Claude Opus 5.5 vs DeepSeek V4 Flash (0731)

At a glance

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

The GA release of DeepSeek's efficiency-optimized V4 Flash, re-post-trained for coding, reasoning, and agent workflows.

1.0M ctx$0.01/$1.28 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
Sources:Epoch AI·OpenRouter· as of 2026-10-02
Reasoning & Knowledge
Graduate Science90.6%Factual Recall115%72.2%
Math
Competition Math6%100.0%
Agentic
Novel Reasoning51%92.5%
Reasoning
CodingInsufficient data
AgenticInsufficient data
Sources:Epoch AI·OpenRouter· as of 2026-10-02
Cheaper96%
Reasoning & Knowledge
Graduate Science91.0%Factual Recall33.6%
Math
Competition Math94.4%
Agentic
Novel Reasoning61.4%
Specs
1M
Context
128K
Max output
Sep 2026
Released
1.0M
Context
256K
Max output
Jul 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
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
Live pricing, shown before you run
Input100%$0.01/M tokens
Output94%$1.28/M tokens
Cache read95%$0.01/M tokens
Chat with Claude Opus 5.5Go to model
Chat with DeepSeek V4 Flash (0731)Go to model
Frequently Asked Questions: Claude Opus 5.5 vs DeepSeek V4 Flash (0731)▼

Which is better, Claude Opus 5.5 or DeepSeek V4 Flash (0731)?

▼

Both Claude Opus 5.5 and DeepSeek V4 Flash (0731) 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, Claude Opus 5.5 or DeepSeek V4 Flash (0731)?

▼

DeepSeek V4 Flash (0731) has a lower blended cost. Claude Opus 5.5: $4.00 input / $20.00 output. DeepSeek V4 Flash (0731): $0.01 input / $1.28 output.

Which has a larger context window, Claude Opus 5.5 or DeepSeek V4 Flash (0731)?

▼

DeepSeek V4 Flash (0731) has a larger context window: Claude Opus 5.5 supports 1M tokens vs DeepSeek V4 Flash (0731) at 1M tokens.

Do both Claude Opus 5.5 and DeepSeek V4 Flash (0731) support vision?

▼

Claude Opus 5.5 supports vision/image input, but DeepSeek V4 Flash (0731) does not.

What are the key differences between Claude Opus 5.5 and DeepSeek V4 Flash (0731)?

▼

Key differences: DeepSeek V4 Flash (0731) is significantly cheaper; only Claude Opus 5.5 supports vision input. 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 Claude Opus 5.5 and DeepSeek V4 Flash (0731) for free on idapt.app to see which performs better for your specific needs.

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