Guide
Best AI models for Roblox development
Updated March 2026 - based on Roblox OpenGameEval benchmarks
Not all AI models perform equally on Roblox tasks. Roblox's own OpenGameEval benchmark tests models on real Studio tasks - from editing scripts to building entire game systems - and the results vary widely.
Top performers (March 2026)
Based on Pass@1 (first-attempt success rate) across all benchmark tasks:
| Rank | Model | Pass@1 | Pass@5 |
|---|---|---|---|
| 1 | Gemini 3.1 Pro | 55.3% | 72.3% |
| 2 | Gemini 3 Flash | 54.7% | 65.7% |
| 3 | Claude Opus 4.6 | 51.9% | 65.0% |
| 4 | GLM 5 | 51.7% | 69.0% |
| 5 | Gemini 3 Pro | 48.9% | 59.4% |
| 6 | Kimi K2.5 Thinking | 45.7% | 66.1% |
| 7 | Claude Opus 4.5 | 44.5% | 56.6% |
| 8 | GLM 4.7 | 43.8% | 62.4% |
| 9 | GPT Codex 5.3 | 40.4% | 61.7% |
| 10 | GLM 4.5 | 40.4% | 53.2% |
Full results for 18+ models available on the OpenGameEval leaderboard.
What do the scores mean?
- Pass@1 - success rate on the first attempt. The most important metric for interactive use where you want the AI to get it right immediately.
- Pass@5 - success rate within 5 attempts. Shows how reliable a model is when you let it retry or iterate.
Recommendations by use case
Best overall: Gemini 3.1 Pro
Highest first-attempt success rate at 55.3%. Strong at complex multi-step tasks. If you want the single best model for Roblox development right now, this is it.
Best for reliability: Claude Opus 4.6
Only 1.4% tool error rate - the lowest of any model tested. When Opus works, it works cleanly. Excellent for architectural decisions and complex refactors where you need the AI to get the structure right.
Best for speed: Gemini 3 Flash
Nearly matches the Pro models (54.7% pass@1) at a fraction of the latency and cost. Ideal for rapid prototyping and quick iterations.
Best value: GLM 5
Competitive with top models (51.7% pass@1) at significantly lower cost. Good choice for high-volume iteration where you're sending many messages per session.
Using multiple models
In BloxBot, you can switch models per-session. A practical workflow:
- Use Gemini Flash for quick edits, prototyping, and exploration
- Switch to Opus 4.6 or Gemini Pro for complex multi-file changes and system architecture
- Use a cheaper model like GLM for high-volume iteration when you're refining details
All models listed here are available in BloxBot. You can also use them through studs.gg in the browser.