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DeepSeek · DeepSeek
No. 27
DeepSeek-R1-0528
Iconic open reasoning model — strong math at low cost, now a generation behind.
Field notes
- Context window
- 164Ktokens
- Max output
- 66Ktokens
- Input price
- $0.50/ 1M tokens
- Output price
- $2.15/ 1M tokens
- Cached input
- $0.14/ 1M tokens
- Modalities
- Text
- Knowledge cutoff
- Apr 2025
- Released
- May 2025
- Parameters
- 671B
- License
- MIT
- Approx. speed
- —
Overview
What this model is
DeepSeek-R1-0528 is DeepSeek's open-weight reasoning flagship (671B MoE, 37B active, MIT), known for transparent long chain-of-thought and excellent math and competition performance at a fraction of closed-model cost. It remains a popular self-hosted reasoner, though 2026 flagships have surpassed it and its long reasoning traces make it slow. Best for math, logic, and reasoning-heavy tasks rather than long agentic coding.
Strengths
- Elite math and competition reasoning
- Transparent, fully open MIT-licensed weights
- Strong on GPQA-Diamond and AIME-style problems
- Distillable into smaller models for cheaper reasoning
Trade-offs
- Slow and token-heavy due to long reasoning traces
- Agentic-coding reliability below the frontier
- Surpassed by newer 2026 reasoners
- Text-only, verbose on simple queries
Best for
- Hard math and scientific reasoning
- Competitive programming and algorithm design
- Reasoning research and distillation
- Self-hosted reasoning workloads
Not ideal for
- Low-latency interactive chat
- Long autonomous agentic coding
Capabilities
Capability profile
Normalized 0–100 scores, comparable across the whole catalog.
- Reasoning
- 85
- Coding
- 68
- Math
- 92
- Writing
- 74
- Knowledge
- 82
- Speed
- 45
- Agentic
- 62
- Vision
- 5
- Multilingual
- 80
- Long Context
- 74
Benchmarks
How it scores
Public benchmark results, with independent third-party results where available. Bars normalize percentages to 100 and Elo ratings to a 1500 ceiling.
BenchmarkResult
Aider Polyglotindependent
CodingAider
71.6%
MATH
MathVendor-reported
97.3%
MMLU-Pro
KnowledgeVendor-reported
85%
GPQA Diamondindependent
ReasoningIndependent aggregators
81%
AIME 2025
MathVendor-reported
87.5%
LiveCodeBenchindependent
CodingLiveCodeBench
65.9%
SWE-bench Verifiedindependent
CodingSWE-bench
57.6%
LMArena Eloindependent
GeneralLMArena
1410Elo