# GPT-5.3 Codex vs Granite 4.2 30B

> Side-by-side benchmark comparison for GPT-5.3 Codex and Granite 4.2 30B across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-5-3-codex-vs-granite-4-2-30b
- Last updated: September 10, 2026

- Shared sourced benchmarks: 2
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Evidence is too thin for a benchmark verdict: GPT-5.3 Codex and Granite 4.2 30B share only 2 sourced benchmark rows.

## Summary

- Only 2 shared sourced benchmark rows are available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.
- Granite 4.2 30B has the lower published output-token price.
- GPT-5.3 Codex has the larger published context window at 400K.

## Model Snapshot

| Property | GPT-5.3 Codex | Granite 4.2 30B |
|----------|----------|----------|
| Creator | OpenAI | IBM |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 400K | 128K |
| Independent public score (not head-to-head) | 64.29 | null |
| Benchmarks Covered | 8 | 14 |
| Pricing (input/output) | $1.75 / $14.00 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 61.6 (Estimated · #15/152)
- Granite 4.2 30B public-lane score: Coming soon

| Benchmark | GPT-5.3 Codex | Granite 4.2 30B | 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 |
| Terminal-Bench 2.1 | Coming soon | 29.2% | Coming soon |
| τ³-bench results | Coming soon | 62.0% | Coming soon |
| BFCL v4 | Coming soon | 61.4% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 62 (Estimated · #17/151)
- Granite 4.2 30B public-lane score: Coming soon

| Benchmark | GPT-5.3 Codex | Granite 4.2 30B | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 85% | 57% | GPT-5.3 Codex |
| SWE-bench Pro | 56.8% | 33.3% | GPT-5.3 Codex |
| SWE-Rebench | 58.2% | Coming soon | Coming soon |
| Vibe Code Bench | 61.77% | Coming soon | Coming soon |
| SWE Multilingual | Coming soon | 41.9% | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 29.2% | Coming soon |
| LiveCodeBench v6 | Coming soon | 75.8% | Coming soon |
| SciCode | Coming soon | 38.8% | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 75.6 (Unranked · 1 rankable row)
- Granite 4.2 30B public-lane score: Coming soon

### Reasoning

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 78.3 (Unranked · 2 rankable rows)
- Granite 4.2 30B public-lane score: 54.7 (Unranked · 2 rankable rows)

### Knowledge

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 65.6 (Estimated · #23/183)
- Granite 4.2 30B public-lane score: Coming soon

| Benchmark | GPT-5.3 Codex | Granite 4.2 30B | Winner |
|-----------|-----------|-----------|--------|
| GPQA | Coming soon | 66.4% | Coming soon |
| MMLU-Pro | Coming soon | 77.6% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 92.6 (#15/123)
- Granite 4.2 30B public-lane score: Coming soon

| Benchmark | GPT-5.3 Codex | Granite 4.2 30B | Winner |
|-----------|-----------|-----------|--------|
| IFBench | Coming soon | 77.2% | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: Coming soon
- Granite 4.2 30B public-lane score: Coming soon

| Benchmark | GPT-5.3 Codex | Granite 4.2 30B | Winner |
|-----------|-----------|-----------|--------|
| AIME 2025 | Coming soon | 89.2% | Coming soon |
| HMMT Feb 2025 | Coming soon | 89.2% | Coming soon |

## FAQ

### Is there enough evidence to pick between GPT-5.3 Codex and Granite 4.2 30B?

Not yet. The models share only 2 sourced benchmark rows, so this mirror reports the available measurements and metadata without naming a broad winner.

### What can I compare safely on this page?

Published pricing, context windows, model type, and individual shared benchmark rows are directly comparable. Independent overall scores and non-overlapping benchmark coverage are labeled separately and should not be read as a controlled head-to-head result.

## Related Comparisons

- [GPT-5.3 Codex vs GPT-5.3-Codex-Spark](/compare/gpt-5-3-codex-vs-gpt-5-3-codex-spark)
- [Granite 4.2 30B vs GPT-5.3-Codex-Spark](/compare/gpt-5-3-codex-spark-vs-granite-4-2-30b)
- [GPT-5.3 Codex vs Granite 4.2 8B](/compare/gpt-5-3-codex-vs-granite-4-2-8b)
- [Granite 4.2 30B vs Granite 4.2 8B](/compare/granite-4-2-30b-vs-granite-4-2-8b)

## Explore More

- [GPT-5.3 Codex profile](/models/gpt-5-3-codex)
- [Granite 4.2 30B profile](/models/granite-4-2-30b)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)