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GPT-5.3 Codex

OpenAI

Strongest in Coding (#43 of 164, on 1 of its 5 boards), weakest in Agents (#111 of 267). Above par in 4 of 4 scopes. Among the models it meets almost everywhere, it finishes behind Claude Opus 5.5 and Claude Opus 5 and ahead of Claude Opus 4.5 and Gemini 3 Pro.

§ 1 · Profile

What it is good at

Bars run from 50 — the average of the models each source lists — so right of the line is above par. The middle column is the gap to whoever leads that scope.

Coding53.4#43/164
Agentic coding54#48/157
Agents50.4#111/267
Knowledge work50.6#76/177

§ 2 · Head to head

What it beats, and what beats it

The same models turn up scope after scope. Counted once: where both were placed, who finished higher. Bars run right for GPT-5.3 Codex, left for the other.

K2 Horizon 0.9Bwon 3 · lost 0
Qwen3.5 0.8Bwon 3 · lost 0
Qwen3.5 2Bwon 3 · lost 0
Nemotron 3.5 30B-A3Bwon 3 · lost 0
Nemotron 3 Superwon 3 · lost 0
Qwen3.5 4Bwon 3 · lost 0
DeepSeek V3won 4 · lost 0
Gemma 3 27B Itwon 4 · lost 0
Granite 4.2 3Bwon 4 · lost 0
Nemotron 3 Ultrawon 4 · lost 0
NVIDIA Nemotron 3 Nano 4Bwon 4 · lost 0
GPT-4.1 Nanowon 4 · lost 0
Gemma 4 E4Bwon 4 · lost 0
GPT-4o Miniwon 4 · lost 0
Mistral Small 4won 4 · lost 0
Gemini 3.1 Flash Litewon 4 · lost 0
Mistral Large 3won 4 · lost 0
Llama 4 Maverick Instructwon 4 · lost 0
Gemini 2.5 Prowon 4 · lost 0
Granite 4.2 8Bwon 4 · lost 0
Mercury 2.5won 4 · lost 0
Claude 3.5 Haikuwon 4 · lost 0
Gemma 4 31Bwon 4 · lost 0
Devstral 2won 4 · lost 0
Nemotron 3.5 Lightningwon 4 · lost 0
Qwen3.5 9Bwon 4 · lost 0
Gemma 4 12Bwon 4 · lost 0
Gemini 3.1 Prowon 4 · lost 0
Mistral Medium 3.5won 4 · lost 0
Qwen3 32Bwon 4 · lost 0
Granite 4.2 30Bwon 4 · lost 0
GPT OSS 120Bwon 4 · lost 0
Ling 3.0 Flashwon 4 · lost 0
GPT-4.1 Miniwon 4 · lost 0
Qwen3.6 35B A3Bwon 4 · lost 0
GPT-5.4 Nanowon 4 · lost 0
Gemini 3.5 Flash Litewon 4 · lost 0
Muse Sparkwon 4 · lost 0
Claude Sonnet 4won 3 · lost 1
GPT-5 Miniwon 3 · lost 1
Claude Haiku 4.5won 3 · lost 1
DeepSeek V3.2won 3 · lost 1
Claude Sonnet 4.5won 3 · lost 1
GLM-4.6won 3 · lost 1
G9v3 39A5Bwon 2 · lost 1
K2 Horizon 32Bwon 2 · lost 1
Muse Glimmer-30Bwon 2 · lost 1
G9v3 3Bwon 2 · lost 1
Command Awon 2 · lost 1
GPT-4.1won 2 · lost 1
GPT-5.2won 2 · lost 1
Gemini 2.5 Flashwon 2 · lost 1
Kimi K2won 2 · lost 1
Grok 4won 2 · lost 1
Grok 4.1 Fastwon 2 · lost 1
Gemini 3 Prowon 2 · lost 1
Claude Opus 4.5won 2 · lost 1
O3 Miniwon 2 · lost 2
DeepSeek R1won 2 · lost 2
K2 Horizon 3.7Bwon 2 · lost 2
Grok 4.3won 2 · lost 2
Inkling Smallwon 2 · lost 2
MiniMax M2.7won 2 · lost 2
GPT-5.4 Miniwon 2 · lost 2
GPT-5.1won 2 · lost 2
Mimo V2.5won 2 · lost 2
Qwen3.6 27Bwon 2 · lost 2
Gemini 3.5 Flashwon 2 · lost 2
GPT-5won 2 · lost 2
Nemotron 3 Ultra 550B A55Bwon 2 · lost 2
Kimi K2.7 Codewon 2 · lost 2
Inklingwon 2 · lost 2
Qwen3.6 Pluswon 2 · lost 2
GLM-4.7won 2 · lost 2
Mimo V2.5 Prowon 2 · lost 2
Grok Build 0.1won 2 · lost 2
Qwen3.7 Maxwon 2 · lost 2
K2 Horizon 7Bwon 2 · lost 2
Ling 3.0 Flash Finwon 2 · lost 2
GLM-5.1won 2 · lost 2
Kimi K2.5won 2 · lost 2
Qwen3.7 Pluswon 2 · lost 2
Gemini 3.6 Flashwon 2 · lost 2
Kimi K2.6won 2 · lost 2
K2 Horizon MoVA 36B A4Bwon 2 · lost 2
Claude Sonnet 4.6won 2 · lost 2
K2 Horizon 375B A23Bwon 2 · lost 2
MiniMax M3won 2 · lost 2
GLM-5.3 Flashwon 2 · lost 2
Claude 3.7 Sonnetwon 1 · lost 2
Grok 4.5won 1 · lost 3
GPT-5.4won 1 · lost 3
Gemini 3.8 Flashwon 1 · lost 3
DeepSeek V4 Flashwon 1 · lost 3
Qwen3.8 27Bwon 1 · lost 3
DeepSeek V4 Flash Visionwon 1 · lost 3
Qwen3.8 Flash Nextwon 1 · lost 3
O3won 0 · lost 3
O4 Miniwon 0 · lost 3
Gemini 3.7 Flashwon 0 · lost 4
GPT-5.5won 0 · lost 4
Muse Spark 1.1won 0 · lost 4
GLM-5.2won 0 · lost 4
Claude Opus 4.7won 0 · lost 4
GPT-6 Lunawon 0 · lost 4
DeepSeek V4 Prowon 0 · lost 4
Claude Opus 4.8won 0 · lost 4
GPT-5.6 Terrawon 0 · lost 4
DeepSeek V4.1 Flashwon 0 · lost 4
GPT-5.6 Lunawon 0 · lost 4
Claude Sonnet 5won 0 · lost 4
Muse Spark 1.2won 0 · lost 4
GPT-5.6 Solwon 0 · lost 4
GPT-6 Solwon 0 · lost 4
Kimi K3won 0 · lost 4
GPT-6 Astrawon 0 · lost 4
GLM-5.3won 0 · lost 4
Grok 4.6won 0 · lost 4
Mimo V2.6 Prowon 0 · lost 4
Muse Spark 1.3won 0 · lost 4
Qwen3.8 Maxwon 0 · lost 4
Grok 4.7won 0 · lost 4
Claude Fable 5.1won 0 · lost 4
Claude Fable 5won 0 · lost 4
Claude Opus 5won 0 · lost 4
Claude Opus 5.5won 0 · lost 4

§ 3 · Sources

Where the numbers come from

2 publications, 3 figures. Every one links to the page it was read from.

AA-Briefcase ↗1 measureread 2026-09-27
AA-Briefcase 866
Vals.ai ↗2 measuresread 2026-09-27
Vals · SWE-bench Verified 78% (Mini-SWE-agent)Vals · Vibe Code Bench 61.77% (OpenHands)

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