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DeepSeek V4 Flash vs GPT-5.6 Luna — Price, Context, and Capability Compared

Verdict

GPT-5.6 Luna costs 2.6× more per blended million tokens than DeepSeek V4 Flash. GPT-5.6 Luna has the larger context window (400,000 tokens). Default to DeepSeek V4 Flash unless you specifically need GPT-5.6 Luna's edge.

Spec comparison

DeepSeek V4 FlashGPT-5.6 Luna
Price (input)$0.14/M$0.20/M
Price (output)$0.28/M$1.20/M
Blended price$0.17/M$0.45/M
Context window128,000 tokens400,000 tokens
Max output32,000 tokens64,000 tokens
Modalitiestexttext, vision
Reasoning modeNoNo
Released2026-052026-06
Speed132 t/s126 t/s

Cost at scale (3:1 blended)

Tokens / monthDeepSeek V4 FlashGPT-5.6 LunaDelta
1,000,000$0.17$0.45$0.28 (2.6×)
10,000,000$1.75$4.50$2.75 (2.6×)
100,000,000$17.50$45.00$27.50 (2.6×)

Choose DeepSeek V4 Flash if…

  • Latest DeepSeek flagship, non-thinking mode
  • Aggressively cheap per-token pricing
  • Strong algorithmic coding
  • High-volume coding and text workloads where budget is the top priority.

Choose GPT-5.6 Luna if…

  • Cheapest current GPT-5.6 tier
  • Low latency for high-volume calls
  • Vision input included
  • High-volume, latency-sensitive tasks like classification, extraction, and chat.

Run this exact matchup right now

Send the same prompt to DeepSeek V4 Flash and GPT-5.6 Luna side by side and see the outputs yourself.

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FAQ

Is DeepSeek V4 Flash cheaper than GPT-5.6 Luna?

DeepSeek V4 Flash is cheaper, at $0.17 per million blended tokens vs $0.45 for GPT-5.6 Luna.

Which has the bigger context window, DeepSeek V4 Flash or GPT-5.6 Luna?

GPT-5.6 Luna has the larger context window: 400,000 tokens vs 128,000.

Can DeepSeek V4 Flash replace GPT-5.6 Luna for coding?

Both are viable for coding. Latest DeepSeek flagship, non-thinking mode (DeepSeek V4 Flash) vs Cheapest current GPT-5.6 tier (GPT-5.6 Luna) — pick based on which strength matters more for your workload.

Which is faster, DeepSeek V4 Flash or GPT-5.6 Luna?

DeepSeek V4 Flash is faster: 132 t/s vs 126 t/s, measured on our speed benchmarks.

Related

DeepSeek V4 Flash pricingGPT-5.6 Luna pricingvs DeepSeek V4 Provs DeepSeek V4 Provs GPT-4o Minivs GPT-OSS 120BCheap model tests

Pricing verified 2026-06-14. Specs verified 2026-08-08.