# GPT-5.3 Codex vs GPT-5.4 Pro

> Side-by-side benchmark comparison for GPT-5.3 Codex and GPT-5.4 Pro across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-5-3-codex-vs-gpt-5-4-pro
- Last updated: September 4, 2026

- Shared sourced benchmarks: 0
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

No benchmark verdict yet: there is no shared sourced benchmark row for GPT-5.3 Codex and GPT-5.4 Pro.

## Summary

- GPT-5.3 Codex and GPT-5.4 Pro do not currently share a sourced benchmark row. The mirror therefore compares metadata, pricing, context windows, and each model's separately reported coverage without naming a benchmark winner.

## Model Snapshot

| Property | GPT-5.3 Codex | GPT-5.4 Pro |
|----------|----------|----------|
| Creator | OpenAI | OpenAI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 400K | 1.05M |
| Independent public score (not head-to-head) | 65.22 | 61.75 |
| Benchmarks Covered | 8 | 10 |
| Pricing (input/output) | $1.75 / $14.00 | $30.00 / $180.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 62.3 (Estimated · #19/151)
- GPT-5.4 Pro public-lane score: 58.1 (Estimated · #33/151)

| Benchmark | GPT-5.3 Codex | GPT-5.4 Pro | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 77.3% | Coming soon | Coming soon |
| OSWorld-Verified | 64.7% | Coming soon | Coming soon |
| Gert Labs | 57.47% | Coming soon | Coming soon |
| JobBench | 33.7% | Coming soon | Coming soon |
| BrowseComp | Coming soon | 89.3% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 62.7 (Supported · #16/183)
- GPT-5.4 Pro public-lane score: Coming soon

| Benchmark | GPT-5.3 Codex | GPT-5.4 Pro | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 85% | Coming soon | Coming soon |
| SWE-bench Pro | 56.8% | Coming soon | Coming soon |
| SWE-Rebench | 58.2% | Coming soon | Coming soon |
| Vibe Code Bench | 61.77% | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 75.6 (Unranked · 1 rankable row)
- GPT-5.4 Pro public-lane score: Coming soon

### Reasoning

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 77.3 (Unranked · 2 rankable rows)
- GPT-5.4 Pro public-lane score: 70.1 (Unranked · 2 rankable rows)

| Benchmark | GPT-5.3 Codex | GPT-5.4 Pro | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | Coming soon | 83.3% | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 66.3 (Estimated · #22/181)
- GPT-5.4 Pro public-lane score: 60.7 (Estimated · #39/181)

| Benchmark | GPT-5.3 Codex | GPT-5.4 Pro | Winner |
|-----------|-----------|-----------|--------|
| HLE | Coming soon | 58.7% | Coming soon |
| FrontierScience | Coming soon | 36.7% | Coming soon |
| FrontierScience Research | Coming soon | 36.7% | Coming soon |
| HLE w/o tools | Coming soon | 42.7% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 92.3 (#15/120)
- GPT-5.4 Pro public-lane score: Coming soon

### Mathematics

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: Coming soon
- GPT-5.4 Pro public-lane score: 69 (Unranked · 4 rankable rows)

| Benchmark | GPT-5.3 Codex | GPT-5.4 Pro | Winner |
|-----------|-----------|-----------|--------|
| IPhO 2025 (Theory) | Coming soon | 93.5% | Coming soon |
| FrontierMath (legacy) | Coming soon | 50% | Coming soon |
| FrontierMath v2 (Tiers 1-3) | Coming soon | 50.000% | Coming soon |
| FrontierMath v2 (Tier 4) | Coming soon | 37.500% | Coming soon |

## FAQ

### Can I compare GPT-5.3 Codex and GPT-5.4 Pro on BenchLM yet?

Not fully yet. BenchLM is tracking both models, but sourced benchmark coverage is still incomplete for a fair score-level comparison.

### Why does this page show "coming soon" values?

BenchLM only calls winners when public benchmark coverage is available on both sides of the comparison.

## Related Comparisons

- [GPT-5.3 Codex vs GPT-5.3-Codex-Spark](/compare/gpt-5-3-codex-vs-gpt-5-3-codex-spark)
- [GPT-5.4 Pro vs GPT-5.3-Codex-Spark](/compare/gpt-5-3-codex-spark-vs-gpt-5-4-pro)
- [GPT-5.3 Codex vs GPT-5.4](/compare/gpt-5-3-codex-vs-gpt-5-4)
- [GPT-5.4 Pro vs GPT-5.4](/compare/gpt-5-4-vs-gpt-5-4-pro)

## Explore More

- [GPT-5.3 Codex profile](/models/gpt-5-3-codex)
- [GPT-5.4 Pro profile](/models/gpt-5-4-pro)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)