# GLM-5.3-Flash vs GPT-6 Luna

> Side-by-side benchmark comparison for GLM-5.3-Flash and GPT-6 Luna across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/glm-5-3-flash-vs-gpt-6-luna
- Last updated: September 22, 2026

- Shared sourced benchmarks: 1
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Evidence is too thin for a benchmark verdict: GLM-5.3-Flash and GPT-6 Luna share only 1 sourced benchmark row.

## Summary

- Only 1 shared sourced benchmark row is available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.
- GLM-5.3-Flash has the lower published output-token price.
- GPT-6 Luna has the larger published context window at 1.05M.

## Model Snapshot

| Property | GLM-5.3-Flash | GPT-6 Luna |
|----------|----------|----------|
| Creator | Z.AI | OpenAI |
| Type | Open Weight | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 1.05M |
| Independent public score (not head-to-head) | 66.8 | 62.33 |
| Benchmarks Covered | 19 | 7 |
| Pricing (input/output) | $0.00 / $0.00 | $0.10 / $0.50 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- GLM-5.3-Flash public-lane score: 59.3 (Supported · #28/157)
- GPT-6 Luna public-lane score: 56.7 (Estimated · #35/157)

| Benchmark | GLM-5.3-Flash | GPT-6 Luna | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 84.3% | Coming soon | Coming soon |
| Toolathlon-Verified | 78.4% | Coming soon | Coming soon |
| AutomationBench | 48.8% | Coming soon | Coming soon |
| Agents' Last Exam | 26.3% | Coming soon | Coming soon |
| HLE w/ tools | 55.3% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 62.9% | Coming soon | Coming soon |
| ExploitGym | Coming soon | 11.6% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- GLM-5.3-Flash public-lane score: 55.7 (Supported · #41/159)
- GPT-6 Luna public-lane score: 66.6 (Estimated · #11/159)

| Benchmark | GLM-5.3-Flash | GPT-6 Luna | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 84.3% | Coming soon | Coming soon |
| DeepSWE | 63.4% | 66.6% | GPT-6 Luna |
| NL2Repo | 56.3% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 80.5% | Coming soon | Coming soon |
| SWE-bench (Vals) | 92.0% | Coming soon | Coming soon |
| OpenHarmony Bench | 57.3% | Coming soon | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- GLM-5.3-Flash public-lane score: Coming soon
- GPT-6 Luna public-lane score: 78.3 (Unranked · 2 rankable rows)

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- GLM-5.3-Flash public-lane score: 80.4 (#11/50)
- GPT-6 Luna public-lane score: 71.3 (Unranked · 1 rankable row)

| Benchmark | GLM-5.3-Flash | GPT-6 Luna | Winner |
|-----------|-----------|-----------|--------|
| OfficeQA Pro | 62.4% | Coming soon | Coming soon |
| CharXiv | 89.4% | Coming soon | Coming soon |
| Chartography (tools) | 78.0% | Coming soon | Coming soon |
| BabyVision | 53.4% | Coming soon | Coming soon |
| MMVU | 80.5% | Coming soon | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- GLM-5.3-Flash public-lane score: 62 (Supported · #31/189)
- GPT-6 Luna public-lane score: 63.6 (Estimated · #29/189)

| Benchmark | GLM-5.3-Flash | GPT-6 Luna | Winner |
|-----------|-----------|-----------|--------|
| GPQA Diamond (Vals) | 86.4% | Coming soon | Coming soon |
| MMLU-Pro (Vals) | 86.1% | Coming soon | Coming soon |
| HealthBench (raw) | Coming soon | 50.0% | Coming soon |
| HealthBench (length-adjusted) | Coming soon | 54.5% | Coming soon |
| HealthBench Professional | Coming soon | 60.8% | Coming soon |
| HealthBench Professional (raw) | Coming soon | 61.2% | Coming soon |
| HealthBench Hard | Coming soon | 31.4% | Coming soon |

## FAQ

### Is there enough evidence to pick between GLM-5.3-Flash and GPT-6 Luna?

Not yet. The models share only 1 sourced benchmark row, 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

- [GLM-5.3-Flash vs GLM-5.3](/compare/glm-5-3-vs-glm-5-3-flash)
- [GPT-6 Luna vs GLM-5.3](/compare/glm-5-3-vs-gpt-6-luna)
- [GLM-5.3-Flash vs GLM-5.2](/compare/glm-5-2-vs-glm-5-3-flash)
- [GPT-6 Luna vs GLM-5.2](/compare/glm-5-2-vs-gpt-6-luna)

## Explore More

- [GLM-5.3-Flash profile](/models/glm-5-3-flash)
- [GPT-6 Luna profile](/models/gpt-6-luna)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)