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DeepSeek V4 vs o4

DeepSeek vs OpenAI. Specs, benchmarks, and real per-task cost — all in one page.

Verdict

DeepSeek V4 is ~150.0× cheaper on a 3:1 input:output blend. DeepSeek V4 is open-weights, the other is proprietary.

DeepSeek

The shock-the-market moment of 2026. Frontier coding quality at 1/50th the price of Opus.

Unbeatable $/qualityOpen weightsGreat at code

OpenAI

Deep-reasoning model. Spends more tokens thinking to crush math, science, and hard coding problems.

State-of-the-art math and scienceExtremely high-ceiling reasoning

Pricing

Input / 1M$0.14$15.00

Output / 1M$0.28$60.00

Context128K200K

Max output16K100K

LicenseOpen weightsProprietary

Released2026-02-202026-02-18

Benchmarks

LMSYS ELO1334.0—

MMLU Pro85.493.8

HumanEval91.592.3

SWE-Bench54.168.0

MATH88.796.2

GPQA—82.5

IFEval85.8—

Per-task cost

Summarize a 1-hour meeting transcript$0.0022$0.255

Review a 500-line pull request$0.0017$0.240

Answer a customer support ticket$0.0006$0.093

Extract structured data from a resume$0.0010$0.135

Debug a stack trace with context$0.0014$0.210

Per-call cost using published token counts for each task. Real-world prompts vary.

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