# Gemini 3.8 Live Extended Thinking vs GPT-5.6 Luna

> Side-by-side benchmark comparison for Gemini 3.8 Live Extended Thinking and GPT-5.6 Luna across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gemini-3-8-live-extended-thinking-vs-gpt-5-6-luna
- Last updated: September 15, 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 Gemini 3.8 Live Extended Thinking and GPT-5.6 Luna.

## Summary

- Gemini 3.8 Live Extended Thinking and GPT-5.6 Luna 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 | Gemini 3.8 Live Extended Thinking | GPT-5.6 Luna |
|----------|----------|----------|
| Creator | Google | OpenAI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 128K | 1.05M |
| Independent public score (not head-to-head) | null | 64.66 |
| Benchmarks Covered | 0 | 30 |
| Pricing (input/output) | $0.75 / $4.50 | $0.20 / $1.20 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Gemini 3.8 Live Extended Thinking public-lane score: Coming soon
- GPT-5.6 Luna public-lane score: 56.6 (Supported · #33/153)

| Benchmark | Gemini 3.8 Live Extended Thinking | GPT-5.6 Luna | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 3.0 | Coming soon | 14.3% | Coming soon |
| Terminal-Bench 2.0 | Coming soon | 84.7% | Coming soon |
| BrowseComp | Coming soon | 83.3% | Coming soon |
| OSWorld 2.0 | Coming soon | 45.6% | Coming soon |
| CyberGym | Coming soon | 77.9% | Coming soon |
| ExploitGym | Coming soon | 12.4% | Coming soon |
| Toolathlon | Coming soon | 53.4% | Coming soon |
| Terminal-Bench 2.1 (Vals) | Coming soon | 79.0% | Coming soon |
| ApprenticeBench | Coming soon | 7% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Gemini 3.8 Live Extended Thinking public-lane score: Coming soon
- GPT-5.6 Luna public-lane score: 66.8 (Supported · #9/152)

| Benchmark | Gemini 3.8 Live Extended Thinking | GPT-5.6 Luna | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Pro | Coming soon | 62.7% | Coming soon |
| Terminal-Bench 2.0 | Coming soon | 84.7% | Coming soon |
| DeepSWE | Coming soon | 67.2% | Coming soon |
| FrontierCode 1.1 Extended | Coming soon | 55.1% | Coming soon |
| cursorBench32 | Coming soon | 61.1% | Coming soon |
| VulcanBench v3 | Coming soon | 85.5% | Coming soon |
| SWE-bench (Vals) | Coming soon | 93.0% | Coming soon |
| cursorBench40 | Coming soon | 35.9% | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Gemini 3.8 Live Extended Thinking public-lane score: Coming soon
- GPT-5.6 Luna public-lane score: 67.1 (#21/48)

| Benchmark | Gemini 3.8 Live Extended Thinking | GPT-5.6 Luna | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | Coming soon | 78.4% | Coming soon |
| MMMU-Pro w/ Python | Coming soon | 79.5% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Gemini 3.8 Live Extended Thinking public-lane score: Coming soon
- GPT-5.6 Luna public-lane score: 51.2 (#19/20)

| Benchmark | Gemini 3.8 Live Extended Thinking | GPT-5.6 Luna | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | Coming soon | 59.5% | Coming soon |
| ARC-AGI-3 | Coming soon | 0.2% | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- Gemini 3.8 Live Extended Thinking public-lane score: Coming soon
- GPT-5.6 Luna public-lane score: 64 (Supported · #27/183)

| Benchmark | Gemini 3.8 Live Extended Thinking | GPT-5.6 Luna | Winner |
|-----------|-----------|-----------|--------|
| GPQA | Coming soon | 92.3% | Coming soon |
| GPQA-D | Coming soon | 92.3% | Coming soon |
| HealthBench Professional | Coming soon | 55.7% | Coming soon |
| HealthBench Hard | Coming soon | 32.0% | Coming soon |
| GPQA Diamond (Vals) | Coming soon | 91.7% | Coming soon |
| MMLU-Pro (Vals) | Coming soon | 86.0% | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- Gemini 3.8 Live Extended Thinking public-lane score: Coming soon
- GPT-5.6 Luna public-lane score: 94.4 (Unranked · 3 rankable rows)

| Benchmark | Gemini 3.8 Live Extended Thinking | GPT-5.6 Luna | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath (legacy) | Coming soon | 78.6% | Coming soon |
| FrontierMath v2 (Tiers 1-3) | Coming soon | 78.600% | Coming soon |
| FrontierMath v2 (Tier 4) | Coming soon | 58.500% | Coming soon |

## FAQ

### Can I compare Gemini 3.8 Live Extended Thinking and GPT-5.6 Luna 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

- [Gemini 3.8 Live Extended Thinking vs Gemini 3.8 Live](/compare/gemini-3-8-live-vs-gemini-3-8-live-extended-thinking)
- [GPT-5.6 Luna vs Gemini 3.8 Live](/compare/gemini-3-8-live-vs-gpt-5-6-luna)
- [Gemini 3.8 Live Extended Thinking vs GPT-5.6 Sol](/compare/gemini-3-8-live-extended-thinking-vs-gpt-5-6-sol)
- [GPT-5.6 Luna vs GPT-5.6 Sol](/compare/gpt-5-6-luna-vs-gpt-5-6-sol)

## Explore More

- [Gemini 3.8 Live Extended Thinking profile](/models/gemini-3-8-live-extended-thinking)
- [GPT-5.6 Luna profile](/models/gpt-5-6-luna)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)