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DeepSeek V4 Pro vs GPT-5.6 Sol — Price, Context, and Capability Compared

Verdict

GPT-5.6 Sol costs 20.7× more per blended million tokens than DeepSeek V4 Pro. GPT-5.6 Sol has the larger context window (400,000 tokens). Default to DeepSeek V4 Pro unless you specifically need GPT-5.6 Sol's edge.

Spec comparison

DeepSeek V4 ProGPT-5.6 Sol
Price (input)$0.43/M$5.00/M
Price (output)$0.87/M$30.00/M
Blended price$0.54/M$11.25/M
Context window128,000 tokens400,000 tokens
Max output64,000 tokens128,000 tokens
Modalitiestexttext, vision
Reasoning modeYesYes
Released2026-052026-06
Speed68 t/s44 t/s

Cost at scale (3:1 blended)

Tokens / monthDeepSeek V4 ProGPT-5.6 SolDelta
1,000,000$0.54$11.25$10.71 (20.7×)
10,000,000$5.44$112.50$107.06 (20.7×)
100,000,000$54.37$1125.00$1070.63 (20.7×)

Choose DeepSeek V4 Pro if…

  • Thinking mode with visible chain-of-thought
  • Frontier-level math and competition coding
  • Still far cheaper than closed frontier models
  • Rigorous math, proofs, and hard algorithmic problems on a budget.

Choose GPT-5.6 Sol if…

  • Strongest OpenAI model for agentic, long-horizon coding
  • Deep reasoning mode for multi-step planning
  • Native vision input
  • Complex, multi-step professional and coding work where accuracy matters more than cost.

Run this exact matchup right now

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FAQ

Is DeepSeek V4 Pro cheaper than GPT-5.6 Sol?

DeepSeek V4 Pro is cheaper, at $0.54 per million blended tokens vs $11.25 for GPT-5.6 Sol.

Which has the bigger context window, DeepSeek V4 Pro or GPT-5.6 Sol?

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

Can DeepSeek V4 Pro replace GPT-5.6 Sol for coding?

Both are viable for coding. Thinking mode with visible chain-of-thought (DeepSeek V4 Pro) vs Strongest OpenAI model for agentic, long-horizon coding (GPT-5.6 Sol) — pick based on which strength matters more for your workload.

Which is faster, DeepSeek V4 Pro or GPT-5.6 Sol?

DeepSeek V4 Pro is faster: 68 t/s vs 44 t/s, measured on our speed benchmarks.

Related

DeepSeek V4 Pro pricingGPT-5.6 Sol pricingvs GPT-5.6 Lunavs GPT-OSS 120Bvs DeepSeek V4 Flashvs Claude Fable 5Cheap model tests

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