# GPT-5.3 Codex Benchmark Scores & Performance

> GPT-5.3 Codex by OpenAI scores 60.48/100 overall, ranking #54 out of 954 AI models.

Canonical page: https://benchlm.ai/models/gpt-5-3-codex

Last updated: October 17, 2026

## Model Details

| Property | Value |
|----------|-------|
| Creator | OpenAI |
| Source Type | Proprietary |
| Reasoning Type | Reasoning |
| Context Window | 400K |
| Overall Score | 60.48/100 |
| Overall Rank | #54 of 954 |

## Family & Coverage

- Family: GPT-5.3 Codex
- Variant: base
- Benchmarks covered: 23 of 639
- Sibling models: [GPT-5.3-Codex-Spark](/models/gpt-5-3-codex-spark)
- Coverage note: BenchLM currently has partial benchmark coverage for this model, so the overall score is conservative.

## Agentic Benchmarks

| Benchmark | Score | Source |
|-----------|-------|--------|
| [Terminal-Bench 2.0](/benchmarks/terminal-bench-2) | 77.3% | [OpenAI: GPT-5.3-Codex System Card](https://cdn.openai.com/pdf/23eca107-a9b1-4d2c-b156-7deb4fbc697c/GPT-5-3-Codex-System-Card-02.pdf) |
| [OSWorld-Verified](/benchmarks/osworld-verified) | 64.7% | [OpenAI: GPT-5.3-Codex System Card](https://cdn.openai.com/pdf/23eca107-a9b1-4d2c-b156-7deb4fbc697c/GPT-5-3-Codex-System-Card-02.pdf) |
| [τ²-bench results](/benchmarks/tau2-bench) | 86% | [Artificial Analysis model benchmarks](https://artificialanalysis.ai/models/gpt-5-3-codex) |
| [Gert Labs](/benchmarks/gertlabs) | 57.47% | [Gert Labs rankings](https://gertlabs.com/rankings) |
| [JobBench](/benchmarks/jobbench) | 33.7% | [JobBench paper](https://arxiv.org/abs/2605.26329) |

## Coding Benchmarks

| Benchmark | Score | Source |
|-----------|-------|--------|
| [SWE-bench Verified](/benchmarks/swe-bench-verified) | 85% | [OpenAI: GPT-5.3-Codex System Card](https://cdn.openai.com/pdf/23eca107-a9b1-4d2c-b156-7deb4fbc697c/GPT-5-3-Codex-System-Card-02.pdf) |
| [SWE-bench Pro](/benchmarks/swe-bench-pro) | 56.8% | [OpenAI: GPT-5.3-Codex System Card](https://cdn.openai.com/pdf/23eca107-a9b1-4d2c-b156-7deb4fbc697c/GPT-5-3-Codex-System-Card-02.pdf) |
| [SWE-Rebench](/benchmarks/swe-rebench) | 58.2% | [SWE-Rebench leaderboard](https://swe-rebench.com/?insight=sep_2025) |
| [Terminal-Bench 2.0](/benchmarks/terminal-bench-2) | 77.3% | [OpenAI: GPT-5.3-Codex System Card](https://cdn.openai.com/pdf/23eca107-a9b1-4d2c-b156-7deb4fbc697c/GPT-5-3-Codex-System-Card-02.pdf) |
| [Vibe Code Bench](/benchmarks/vibecodebench) | 61.77% | [Vals AI: Vibe Code Bench v1.1](https://www.vals.ai/benchmarks/vibe-code) |
| [LiveCodeBench (Vals)](/benchmarks/valslivecodebench) | 87.3% | [Vals AI: LiveCodeBench leaderboard](https://www.vals.ai/models/openai_gpt-5.3-codex) |
| [SWE-bench (Vals)](/benchmarks/valsswebench) | 78.0% | [Vals AI: SWE-bench leaderboard](https://www.vals.ai/models/openai_gpt-5.3-codex) |

## Multimodal & Grounded Benchmarks

| Benchmark | Score | Source |
|-----------|-------|--------|
| [AA-MMMU-Pro](/benchmarks/mmmu-pro) | 78.5% | [Artificial Analysis model benchmarks](https://artificialanalysis.ai/models/gpt-5-3-codex) |
| [Design Arena Website](/benchmarks/designarenawebsite) | 1164 | [OpenRouter model benchmarks](https://openrouter.ai/openai/gpt-5.3-codex/benchmarks) |

## Reasoning Benchmarks

| Benchmark | Score | Source |
|-----------|-------|--------|
| [AA-LCR](/benchmarks/lcr) | 83.3% | [Artificial Analysis model benchmarks](https://artificialanalysis.ai/models/gpt-5-3-codex) |
| [CritPt](/benchmarks/critpt) | 16.9% | [Artificial Analysis model benchmarks](https://artificialanalysis.ai/models/gpt-5-3-codex) |

## Knowledge Benchmarks

| Benchmark | Score | Source |
|-----------|-------|--------|
| [Artificial Analysis Intelligence Index](/benchmarks/artificialanalysis) | 32.5% | [Artificial Analysis model benchmarks](https://artificialanalysis.ai/models/gpt-5-3-codex) |
| [AA-GPQA Diamond](/benchmarks/gpqa-diamond) | 91.5% | [Artificial Analysis model benchmarks](https://artificialanalysis.ai/models/gpt-5-3-codex) |
| [AA-HLE](/benchmarks/aahle) | 42.5% | [Artificial Analysis model benchmarks](https://artificialanalysis.ai/models/gpt-5-3-codex) |
| [AA-Omniscience Index](/benchmarks/aaomniscienceindex) | 10.9% | [Artificial Analysis model benchmarks](https://artificialanalysis.ai/models/gpt-5-3-codex) |
| [AA-Omniscience Accuracy](/benchmarks/omniscienceaccuracy) | 52.9% | [Artificial Analysis model benchmarks](https://artificialanalysis.ai/models/gpt-5-3-codex) |
| [AA-Omniscience Hallucination Rate](/benchmarks/omnisciencehallucinationrate) | 89.2% | [Artificial Analysis model benchmarks](https://artificialanalysis.ai/models/gpt-5-3-codex) |

## Instruction Following Benchmarks

| Benchmark | Score | Source |
|-----------|-------|--------|
| [AA-IFBench](/benchmarks/ifbench) | 75.4% | [Artificial Analysis model benchmarks](https://artificialanalysis.ai/models/gpt-5-3-codex) |

## Other OpenAI Models

- [GPT-6.1 Sol](/models/gpt-6-1-sol) - Score: 84.07
- [GPT-6 Astra](/models/gpt-6-astra) - Score: 83.88
- [GPT-6 Sol](/models/gpt-6-sol) - Score: 78.48
- [GPT-5.6 Sol](/models/gpt-5-6-sol) - Score: 75.32
- [GPT-5.5 Pro](/models/gpt-5-5-pro) - Score: 73.37
- [GPT-5.6 Terra](/models/gpt-5-6-terra) - Score: 70.21
- [GPT-5.5](/models/gpt-5-5) - Score: 69.29
- [GPT-5.4 Pro](/models/gpt-5-4-pro) - Score: 68.6
- [GPT-5.4](/models/gpt-5-4) - Score: 66.7
- [GPT-6 Luna](/models/gpt-6-luna) - Score: 66.66
- [GPT-5.2 Pro](/models/gpt-5-2-pro) - Score: 66.65
- [GPT-5.6 Luna](/models/gpt-5-6-luna) - Score: 64.35
- [GPT-5.2](/models/gpt-5-2) - Score: 59.86
- [GPT-5.1](/models/gpt-5-1) - Score: 57.21
- [GPT-5.2-Codex](/models/gpt-5-2-codex) - Score: 55.3
- [GPT-5.4 mini](/models/gpt-5-4-mini) - Score: 53.41
- [GPT-5.1-Codex](/models/gpt-5-1-codex) - Score: 50.37
- [GPT-5 mini](/models/gpt-5-mini) - Score: 48.39
- [GPT-5.4 nano](/models/gpt-5-4-nano) - Score: 46.86
- [GPT-5 (medium)](/models/gpt-5-medium) - Score: 45.99
- [o3](/models/o3) - Score: 45.44
- [o3-pro](/models/o3-pro) - Score: 45.38
- [o3-mini](/models/o3-mini) - Score: 39.56
- [o1](/models/o1) - Score: 38.38
- [GPT-4.1](/models/gpt-4-1) - Score: 37.6
- [GPT-5 nano](/models/gpt-5-nano) - Score: 37.37
- [GPT-OSS 120B](/models/gpt-oss-120b) - Score: 37.32
- [o1-preview](/models/o1-preview) - Score: 35.98
- [o1-pro](/models/o1-pro) - Score: 35.72
- [GPT-OSS 20B](/models/gpt-oss-20b) - Score: 33.32
- [GPT-4o](/models/gpt-4o) - Score: 29.92
- [GPT-4.1 mini](/models/gpt-4-1-mini) - Score: 29.27
- [GPT-4o mini](/models/gpt-4o-mini) - Score: 26.8
- [GPT-4.1 nano](/models/gpt-4-1-nano) - Score: 24.53
- [GPT-4 Turbo](/models/gpt-4-turbo) - Score: 21.54
- [GPT-4.5](/models/gpt-4-5) - Score: not computed
- [GPT-5.1-Codex-Max](/models/gpt-5-1-codex-max) - Score: not computed
- [o4-mini](/models/o4-mini) - Score: not computed
- [o4-mini (high)](/models/o4-mini-high) - Score: not computed
- [o1-mini](/models/o1-mini) - Score: not computed
- [GPT-5.2 Instant](/models/gpt-5-2-instant) - Score: not computed
- [GPT-5.3 Instant](/models/gpt-5-3-instant) - Score: not computed
- [GPT-5 (high)](/models/gpt-5-high) - Score: not computed
- [GPT-5.3-Codex-Spark](/models/gpt-5-3-codex-spark) - Score: not computed
- [GPT-5.6 Luna (low)](/models/gpt-5-6-luna-low) - Score: not computed
- [GPT-6 Luna (low)](/models/gpt-6-luna-low) - Score: not computed
- [GPT-6 Luna (medium)](/models/gpt-6-luna-medium) - Score: not computed
- [GPT-Live-1](/models/gpt-live-1) - Score: not computed
- [GPT-5.6 Cyber](/models/gpt-5-6-cyber) - Score: not computed
- [GPT Live Transcribe](/models/gpt-live-transcribe) - Score: not computed
- [GPT Transcribe](/models/gpt-transcribe) - Score: not computed
- [GPT Realtime 2.1](/models/gpt-realtime-2-1) - Score: not computed
- [GPT Realtime 2.1 Mini](/models/gpt-realtime-2-1-mini) - Score: not computed
- [GPT Audio 1.5](/models/gpt-audio-1-5) - Score: not computed
- [GPT Realtime 1.5](/models/gpt-realtime-1-5) - Score: not computed
- [GPT Realtime mini](/models/gpt-realtime-mini) - Score: not computed
- [GPT Realtime](/models/gpt-realtime) - Score: not computed
- [GPT-4o mini TTS](/models/gpt-4o-mini-tts) - Score: not computed
- [GPT-4o mini Audio](/models/gpt-4o-mini-audio) - Score: not computed
- [GPT-4o Audio](/models/gpt-4o-audio) - Score: not computed
- [Whisper large-v3-turbo](/models/whisper-large-v3-turbo) - Score: not computed
- [GPT Realtime 2](/models/gpt-realtime-2) - Score: not computed