OpenAI · proprietary on Arena · first on Arena 23 April 2025

o3-2025-04-16

62 days in first place

It held first place on Arena in Text (62 days).

Embed

Who held first place

<iframe src="https://jesseahawkins.com/frontier/embed/" title="Frontier: who held first place on each Arena leaderboard, and for how long" width="100%" height="560" style="border:0;max-width:100%" loading="lazy"></iframe>

Credits LMArena.

The open-weights catch-up

<iframe src="https://jesseahawkins.com/frontier/embed/catch-up/" title="Frontier: the days until open weights matched each closed leader" width="100%" height="900" style="border:0;max-width:100%" loading="lazy"></iframe>

Credits LMArena.

The saturation clock

<iframe src="https://jesseahawkins.com/frontier/embed/clock/" title="Frontier: the days from each benchmark’s release to a model at 90%" width="100%" height="640" style="border:0;max-width:100%" loading="lazy"></iframe>

Credits Epoch AI.

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Cite

This page

Jesse Hawkins, “o3-2025-04-16 · Frontier”, jesseahawkins.com, data retrieved 30 Oct 2026. https://jesseahawkins.com/frontier/o3-2025-04-16/. Data: LMArena, Arena leaderboard dataset, revision 4491b06, CC BY 4.0; Epoch AI, Capabilities & benchmarking, CC BY 4.0.

BibTeX

@misc{hawkins2026frontiero320250416,
  author = {Hawkins, Jesse},
  title = {{o3-2025-04-16 · Frontier}},
  year = {2026},
  howpublished = {\url{https://jesseahawkins.com/frontier/o3-2025-04-16/}},
  note = {Data: LMArena, Arena leaderboard dataset, revision 4491b06, CC BY 4.0; Epoch AI, Capabilities \& benchmarking, CC BY 4.0, retrieved 2026-10-30}
}

Arena · LMArena

LMArena, "Arena leaderboard dataset", Hugging Face, revision 4491b06. https://huggingface.co/datasets/lmarena-ai/leaderboard-dataset. CC BY 4.0.

Benchmarks · Epoch AI

Epoch AI, 'Capabilities & benchmarking'. Published online at epoch.ai. Retrieved from 'https://epoch.ai/benchmarks' [online resource]. CC BY 4.0.

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Text: 62 days in first place

last on the board 15 October 2026

1st10th100th

On the board: 23 April 2025 to 15 October 2026
Score: 1410 (1406–1413) on 15 October 2026 · 58,908 votes
First place: 23 April 2025 to 24 June 2025 · 62 days
Catch-up: Open weights matched it on 1 August 2025, 100 days after it first took first place: qwen3-235b-a22b-instruct-2507.

Vision: best place 2

last on the board 9 October 2026

1st10th

On the board: 5 May 2025 to 9 October 2026
Score: 1214 (1208–1221) on 9 October 2026 · 45,599 votes

Epoch AI: o3

released 16 April 2025 · API access

Chess Puzzles 37.0%
FrontierMath-2025-02-28-Private 18.7%
FrontierMath-Tier-4-2025-07-01-Private 2.1%
FrontierMath-Tiers-1-3-v2-Private 33.3%
GPQA diamond 81.8%
MATH level 5 97.8%
Mystery Game Puzzles 29.0%
OTIS Mock AIME 2024-2025 84.4%
SWE-Bench verified 62.3%
SimpleQA Verified 49.4%

When each vendor retires it

every model’s dates

OpenAI 11 Dec 2026 o3-2025-04-16 · 183 days’ notice, from the notice on 11 Jun 2026

Sources

Arena scores come from people voting between two anonymous answers. First place is the highest score; the top two are often within each other’s margin of error. LMArena, Arena leaderboard dataset, revision 4491b06, retrieved 30 October 2026; Epoch AI, Capabilities & benchmarking, retrieved 30 October 2026. Both CC BY 4.0. Retirement dates: each vendor’s own deprecation page, quoted and kept, listed with the record.