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DeepSeek-V4-Pro vs Qwen3.5 27B

DeepSeek · released

Wins 5 of 7 areas

Coding · Agents · Reasoning · Facts · Math

Alibaba · released

Wins 1 of 7 areas

Long documents

DeepSeek-V4-Pro is the stronger all-rounder.Qwen3.5 27B is better at long documents.

Scores updated · 35 tests both models report · How we compare

Where each one wins

Tests won in each of the seven areas where both have results. Each piece is one test, so a longer bar means more evidence; grey means the two scored within a point of each other.

Long documents and following instructions rest on a single test each.

What it costs

Prices per million tokens, roughly 750,000 words. The bars show the cost of a million tokens read plus a million written.

DeepSeek-V4-Pro$0.43 to read · $0.87 to write$1.30Price from Artificial Analysis
Qwen3.5 27B$0.30 to read · $2.40 to write$2.70Price from Alibaba's own price page

DeepSeek-V4-Pro costs 52% less for the same work.

The biggest differences

The tests each model wins by the widest margin, up to three each. Scores are out of 100.

Where DeepSeek-V4-Pro pulls ahead

  • Finds hard-to-locate facts by browsing the webBrowseComp+22.4points aheadDeepSeek-V4-Pro83.4Qwen3.5 27B61
  • Answers hard knowledge questions correctlyAA-Omniscience · Accuracy+22.3points aheadDeepSeek-V4-Pro43Qwen3.5 27B20.7
  • Harvard-MIT high-school math contest problemsHMMT Feb. 2026+14.1points aheadDeepSeek-V4-Pro95.2Qwen3.5 27B81.1

Where Qwen3.5 27B pulls ahead

  • Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+12.6points aheadQwen3.5 27B18.5DeepSeek-V4-Pro5.9
  • Reasons across sets of long documentsAA-LCR+3points aheadQwen3.5 27B77.7DeepSeek-V4-Pro74.7

Every test, side by side

All 35 tests both models report. The winning score is in its model's colour; marks a score checked independently.

CodingDeepSeek-V4-Pro

Full coding ranking

AgentsDeepSeek-V4-Pro

Full agents ranking

ReasoningDeepSeek-V4-Pro

Full reasoning ranking

FactsDeepSeek-V4-Pro

Full facts ranking

MathDeepSeek-V4-Pro

Full math ranking

Long documentsQwen3.5 27B
  • AA-LCRQwen3.5 27B by 374.777.7+3

Full long documents ranking

Following instructionsEven

Full following instructions ranking

Other results13 tests, not counted

Tests outside the eight areas. They are not counted above: several are summary scores built from other tests, or the same test under another name.

Questions people ask

Which is better, DeepSeek-V4-Pro or Qwen3.5 27B?

DeepSeek-V4-Pro wins five of the seven areas where both have results: coding, agents, reasoning, facts and math. Qwen3.5 27B wins long documents. They are level on following instructions.

Which is better for coding?

DeepSeek-V4-Pro. It wins 7 of the 7 coding tests both models report; Qwen3.5 27B wins none.

Which is cheaper?

DeepSeek-V4-Pro costs $0.43 per million input tokens and $0.87 per million output tokens; Qwen3.5 27B costs $0.30 and $2.40. That makes DeepSeek-V4-Pro about 52% cheaper for the same work.

How do you compare the two?

We use the 35 benchmark tests both models have published scores on. The verdict counts the 22 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 13 are listed but not counted, because several are summary scores or repeat a test. Each score is the one shown on the model's own page.

Compare DeepSeek-V4-Pro with

DeepSeek

Across the field

Compare Qwen3.5 27B with

Alibaba

Across the field

All comparisons