GLM 5.2 Speed vs Opus 4.8 and GPT 5.5

Melvin Vivas · X post · 2026-06-27 · Open on X

Topics: LLM Fundamentals, LLMOps, Deployment & Monitoring · Level: beginner

Summary

The creator reacts to how fast GLM 5.2 is, quoting his own comparison post. Served by Fireworks AI, GLM 5.2 makes Opus 4.8 and GPT 5.5 feel slow. It's a reminder that inference speed and the hosting provider matter when picking a model.

Key points

• GLM 5.2 hosted on Fireworks AI felt much faster than Opus 4.8 and GPT 5.5.
• How fast a model feels depends on both the model and the inference provider.
• Speed (latency/throughput) is worth weighing alongside quality when you pick a coding model.

Resources mentioned

• GLM 5.2 · tool · huggingface.co · free
  A GLM-family LLM (the transcript says 'GLM-5-2') that the demo ranked as a strong, affordable model for coding and design.
  Also in: Qwen3.8-Max on the Frontend Code Arena cost-performance frontier (Melvin Vivas on X · notes), Models That Work With the Hermes Agent for Personal Productivity (Melvin Vivas on X · notes), Open Model GLM 5.2 Helped Mitigate OpenAI-Caused Cyberattack (Melvin Vivas on X · notes), AI News Roundup: Claude Fable 5, Scientist AI, ZCode, NVIDIA RL (Melvin Vivas on X · notes) and 27 more
• Fireworks AI · tool · x.com · free
  Fireworks AI's official X account, which posts news about inference and serving open models.
  Also in: FireRouter: cost-aware model routing between open models and Claude Opus (Melvin Vivas on X · notes), GLM 5.2 Hits 446 tok/s on Fireworks AI (Melvin Vivas on X · notes), GLM 5.2 on Fireworks Makes Opus 4.8 and GPT 5.5 Feel Slow (Melvin Vivas on X · notes), Fastest GLM-5.2 Provider: Fireworks AI at 343 tok/s (Melvin Vivas on X · notes) and 4 more

Try this

• Compare model speed across providers before choosing one for interactive coding.