# GPT-5.3 Codex vs Muse Glimmer 30B

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

- Canonical page: https://benchlm.ai/compare/gpt-5-3-codex-vs-muse-glimmer-30b
- Last updated: September 24, 2026

- Shared sourced benchmarks: 3
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.7

## Quick Verdict

Evidence is too thin for a benchmark verdict: GPT-5.3 Codex and Muse Glimmer 30B share only 3 sourced benchmark rows.

## Summary

- Only 3 shared sourced benchmark rows are available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.
- Muse Glimmer 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 | Muse Glimmer 30B |
|----------|----------|----------|
| Creator | OpenAI | Meta |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 400K | 131K |
| Independent public score (not head-to-head) | 62.18 | 41.73 |
| Benchmarks Covered | 10 | 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: 54.2 (Estimated · #31/105)
- Muse Glimmer 30B public-lane score: 27.6 (Estimated · #72/105)

| Benchmark | GPT-5.3 Codex | Muse Glimmer 30B | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 77.3% | Coming soon | Coming soon |
| OSWorld-Verified | 64.7% | 65.9% | Muse Glimmer 30B |
| Gert Labs | 57.47% | Coming soon | Coming soon |
| JobBench | 33.7% | Coming soon | Coming soon |
| MCP Atlas | Coming soon | 75.5% | Coming soon |
| DeepSearchQA | Coming soon | 74.6% | Coming soon |
| skillsBench | Coming soon | 44.3% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 55.9 (Supported · #26/135)
- Muse Glimmer 30B public-lane score: 36.3 (Estimated · #69/135)

| Benchmark | GPT-5.3 Codex | Muse Glimmer 30B | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 85% | 76% | GPT-5.3 Codex |
| SWE-bench Pro | 56.8% | 51.2% | GPT-5.3 Codex |
| SWE-Rebench | 58.2% | Coming soon | Coming soon |
| Vibe Code Bench | 61.77% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 87.3% | Coming soon | Coming soon |
| SWE-bench (Vals) | 78.0% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 51.7% | Coming soon |
| SciCode | Coming soon | 43.6% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 79.3 (Unranked · 2 rankable rows)
- Muse Glimmer 30B public-lane score: 79.3 (Unranked · 2 rankable rows)

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 75.7 (Unranked · 1 rankable row)
- Muse Glimmer 30B public-lane score: 46.3 (#42/50)

| Benchmark | GPT-5.3 Codex | Muse Glimmer 30B | Winner |
|-----------|-----------|-----------|--------|
| CharXiv | Coming soon | 78.8% | Coming soon |
| ScreenSpot Pro | Coming soon | 75.4% | Coming soon |
| OmniDocBench 1.5 | Coming soon | 75.8% | Coming soon |
| MMMU-Pro | Coming soon | 74% | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 64.3 (Estimated · #26/158)
- Muse Glimmer 30B public-lane score: 43.9 (Estimated · #75/158)

### Instruction Following

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 91.2 (#14/124)
- Muse Glimmer 30B public-lane score: 77.7 (#55/124)

| Benchmark | GPT-5.3 Codex | Muse Glimmer 30B | Winner |
|-----------|-----------|-----------|--------|
| IFBench | Coming soon | 77% | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: Coming soon
- Muse Glimmer 30B public-lane score: 75.4 (Unranked · 1 rankable row)

| Benchmark | GPT-5.3 Codex | Muse Glimmer 30B | Winner |
|-----------|-----------|-----------|--------|
| AIME26 | Coming soon | 94.7% | Coming soon |

## FAQ

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

Not yet. The models share only 3 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)
- [Muse Glimmer 30B vs GPT-5.3-Codex-Spark](/compare/gpt-5-3-codex-spark-vs-muse-glimmer-30b)
- [GPT-5.3 Codex vs GPT-6 Astra](/compare/gpt-5-3-codex-vs-gpt-6-astra)
- [Muse Glimmer 30B vs GPT-6 Astra](/compare/gpt-6-astra-vs-muse-glimmer-30b)

## Explore More

- [GPT-5.3 Codex profile](/models/gpt-5-3-codex)
- [Muse Glimmer 30B profile](/models/muse-glimmer-30b)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)