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DeepSeek V4 Pro vs GPT-OSS 120B — Price, Context, and Capability Compared

Verdict

DeepSeek V4 Pro costs 2.1× more per blended million tokens than GPT-OSS 120B. GPT-OSS 120B has the larger context window (131,072 tokens). Default to GPT-OSS 120B unless you specifically need DeepSeek V4 Pro's edge.

Spec comparison

DeepSeek V4 ProGPT-OSS 120B
Price (input)$0.43/M$0.15/M
Price (output)$0.87/M$0.60/M
Blended price$0.54/M$0.26/M
Context window128,000 tokens131,072 tokens
Max output64,000 tokens32,768 tokens
Modalitiestexttext
Reasoning modeYesYes
Released2026-052025-08
Speed68 t/s780 t/s

Cost at scale (3:1 blended)

Tokens / monthDeepSeek V4 ProGPT-OSS 120BDelta
1,000,000$0.54$0.26$0.28 (2.1×)
10,000,000$5.44$2.62$2.81 (2.1×)
100,000,000$54.37$26.25$28.12 (2.1×)

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-OSS 120B if…

  • Open-weight MoE flagship
  • Ultra-fast on Groq LPUs
  • Strong agentic tool-use
  • Self-hostable or Groq-speed agentic workflows on open weights.

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FAQ

Is DeepSeek V4 Pro cheaper than GPT-OSS 120B?

GPT-OSS 120B is cheaper, at $0.26 per million blended tokens vs $0.54 for DeepSeek V4 Pro.

Which has the bigger context window, DeepSeek V4 Pro or GPT-OSS 120B?

GPT-OSS 120B has the larger context window: 131,072 tokens vs 128,000.

Can DeepSeek V4 Pro replace GPT-OSS 120B for coding?

Both are viable for coding. Thinking mode with visible chain-of-thought (DeepSeek V4 Pro) vs Open-weight MoE flagship (GPT-OSS 120B) — pick based on which strength matters more for your workload.

Which is faster, DeepSeek V4 Pro or GPT-OSS 120B?

GPT-OSS 120B is faster: 780 t/s vs 68 t/s, measured on our speed benchmarks.

Related

DeepSeek V4 Pro pricingGPT-OSS 120B pricingvs GPT-5.6 Solvs GPT-5.6 Lunavs DeepSeek V4 Flashvs Llama 3.3 70BCheap model tests

Pricing verified 2026-04-06. Specs verified 2026-08-08.