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Leaderboard · Compare · o3 vs DeepSeek R1 · Updated

o3 vs DeepSeek R1

o3 edges out DeepSeek R1 on the composite (83.7 vs 75.4). The gap is meaningful but not decisive — see the per-benchmark breakdown below.

o3 · composite 83.7 DeepSeek R1 · composite 75.4 frontier vs open-weights
Try o3 → Try DeepSeek R1 → A/B test both via OpenRouter →

At a glance

Speco3DeepSeek R1
ProviderOpenAIDeepSeek
Released2025-042025-01
Tierfrontieropen-weights
LicenseClosedOpen · MIT
Context window200k128k
$ in / out (per 1M)$2.00 / $8.00$0.55 / $2.19

Benchmark scoreboard

Higher is better on every benchmark. Δ shows o3 − DeepSeek R1.

Benchmarko3DeepSeek R1Δ
Chatbot Arena Elo 1380 1357 +23
MMLU-Pro 85.7 84.0 +1.7
GPQA Diamond 87.7 71.5 +16.2
MATH 96.7 97.3 -0.6
HumanEval 92.7 92.0 +0.7
SWE-Bench Verified 71.7 49.2 +22.5

Numbers compiled from provider technical reports and Chatbot Arena snapshots — see methodology.

Don't pick blind — A/B test both models on the same API key.

OpenRouter routes o3, DeepSeek R1, and 100+ other LLMs behind a single API key — pay-as-you-go, no monthly minimum, fallback if a provider is down. Try OpenRouter → (affiliate · supports this site)

o3 vs DeepSeek R1: where each one wins

o3 is stronger on

  • Arena
  • MMLU-Pro
  • GPQA
  • HumanEval
  • SWE-Bench

DeepSeek R1 is stronger on

  • MATH

Cost comparison

At 10M tokens/day (50/50 split), o3 costs ~$50.00/day vs $13.70/day for DeepSeek R1 — DeepSeek R1 is the cheaper pick at this volume.

Verdict

o3 edges out DeepSeek R1 on the composite (83.7 vs 75.4). The gap is meaningful but not decisive — see the per-benchmark breakdown below.

If you can only pick one and your workload is unclear, route via OpenRouter and switch by request — same key, no lock-in.

Frequently asked questions

Which is better, o3 or DeepSeek R1?

o3 edges out DeepSeek R1 on the composite (83.7 vs 75.4). The gap is meaningful but not decisive — see the per-benchmark breakdown below. o3 wins on Arena, MMLU-Pro, GPQA, HumanEval, SWE-Bench; DeepSeek R1 wins on MATH.

What does o3 cost compared to DeepSeek R1?

At 10M tokens/day (50/50 split), o3 costs ~$50.00/day vs $13.70/day for DeepSeek R1 — DeepSeek R1 is the cheaper pick at this volume.

What is the context window of o3 vs DeepSeek R1?

o3: 200k tokens. DeepSeek R1: 128k tokens. o3 has the larger window — useful for long-document RAG and full-codebase prompting.

Is o3 or DeepSeek R1 open source?

o3: closed / proprietary. DeepSeek R1: open weights (MIT).

Can I try o3 and DeepSeek R1 on the same API key?

Yes — OpenRouter routes both models behind a single key, so you can A/B test o3 against DeepSeek R1 without juggling provider accounts.

Model deep-dives: o3 · DeepSeek R1 · Full leaderboard

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