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DeepSeek V4 Flash (0731) vs GPT 5.6 Luna

At a glance

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

1.0M ctx$0.07/$0.18 per M

OpenAI's fastest, most affordable GPT-5.6 tier for high-volume, latency-sensitive work.

1.1M ctx$1.00/$6.00 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
Cheaper96%
Reasoning & Knowledge
Graduate Science—
Agentic
Terminal Tasks—
Reasoning
CodingInsufficient data
MathInsufficient data
Sources:Provider·OpenRouter· as of 2026-07-11
Reasoning & Knowledge
Graduate Science92.3%
Agentic
Terminal Tasks84.7%
Specs
1.0M
Context
256K
Max output
Jul 2026
Released
1.1M
Context
128K
Max output
Jul 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input94%$0.07/M tokens
Output97%$0.18/M tokens
Cache read84%$0.02/M tokens
Live pricing, shown before you run
Input$1.00/M tokens
Output$6.00/M tokens
Cache read$0.10/M tokens
Cache write$1.25/M tokens
Web search$0.01/search
Chat with DeepSeek V4 Flash (0731)Go to model
Chat with GPT 5.6 LunaGo to model
Frequently Asked Questions: DeepSeek V4 Flash (0731) vs GPT 5.6 Luna▼

Which is better, DeepSeek V4 Flash (0731) or GPT 5.6 Luna?

▼

Both DeepSeek V4 Flash (0731) and GPT 5.6 Luna 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 Flash (0731) or GPT 5.6 Luna?

▼

DeepSeek V4 Flash (0731) has a lower blended cost. DeepSeek V4 Flash (0731): $0.07 input / $0.18 output. GPT 5.6 Luna: $1.00 input / $6.00 output.

Which has a larger context window, DeepSeek V4 Flash (0731) or GPT 5.6 Luna?

▼

GPT 5.6 Luna has a larger context window: DeepSeek V4 Flash (0731) supports 1M tokens vs GPT 5.6 Luna at 1.1M tokens.

Do both DeepSeek V4 Flash (0731) and GPT 5.6 Luna support vision?

▼

GPT 5.6 Luna supports vision/image input, but DeepSeek V4 Flash (0731) does not.

What are the key differences between DeepSeek V4 Flash (0731) and GPT 5.6 Luna?

▼

Key differences: DeepSeek V4 Flash (0731) is significantly cheaper; only GPT 5.6 Luna 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 DeepSeek V4 Flash (0731) and GPT 5.6 Luna for free on idapt.app to see which performs better for your specific needs.

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