Claude Opus 5.5 vs Gemini 3.8 Flash
aka Opus 5.5 vs Gemini Flash 3.8
- FasterGemini 3.8 Flash1/1 postsmedian gap ~2.6×
As stated in each post, not a controlled benchmark.
Posts
1
Same prompt, separate runs
3Not a controlled comparison: prompts, tools and time differ.
About this matchup
Claude Opus 5.5 vs Gemini 3.8 Flash in real side-by-side tests: 1 post from X where both got the same prompt; 1 post reports cost or time. Judge coding ability from the actual outputs.
Opus 5.5 vs Gemini 3.8 Flash: which is better for coding?
Which is better for coding, Opus 5.5 or Gemini 3.8 Flash?
None of the 1 post here names one of the two as the better result, so judge the outputs above for the work you care about.
Which is faster, Opus 5.5 or Gemini 3.8 Flash?
1 post states a time for both: Gemini 3.8 Flash was faster in it (~2.6× faster). Times are as stated in each post; tools and settings differ between posts.
What have Opus 5.5 and Gemini 3.8 Flash been tested on?
The most-viewed of the 1 post: one-shot FPS arena, Gemini 3.8 Flash vs Claude Opus 5.5 (@LumeoLab). Categories: Games, 3D & Shaders.
Summary
Claude Opus 5.5 and Gemini 3.8 Flash appear together in 1 post on X: one-shot FPS arena, Gemini 3.8 Flash vs Claude Opus 5.5 (@LumeoLab). In @LumeoLab's one-shot FPS arena, Gemini 3.8 Flash vs Claude Opus 5.5, Gemini 3.8 Flash was faster (91 s vs 3.9 min), as reported in the post.
What each post reports
| Post | Model | Time | Cost | Tokens | Post |
|---|---|---|---|---|---|
| One-shot FPS arena, Gemini 3.8 Flash vs Claude Opus 5.5@LumeoLab | Gemini 3.8 Flash | 91 s | — | — | X post |
| One-shot FPS arena, Gemini 3.8 Flash vs Claude Opus 5.5@LumeoLab | Claude Opus 5.5 | 3.9 min | — | — | X post |
Only numbers stated in each post. “—” means the post doesn’t say.
Quick facts
| Model | Vendor | Released | Input $/1M tokens | Output $/1M tokens | Context (tokens) | Official links |
|---|---|---|---|---|---|---|
| Claude Opus 5.5 | Anthropic | 2026-09-22 | $4 | $20 | 1,000,000 | Model docs |
| Gemini 3.8 Flash |
From the vendors’ official pages, checked 2026-10-19. Standard API list prices; each value links its source and a blank cell could not be verified. The archive’s own numbers above are what each post states.
Models
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