Compare · ModelsLive · 2 picked · head to head
Gemini 3.5 Flash vs GPT-5.1-Codex
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
GPT-5.1-Codex wins on 0/0 benchmarks
Not enough overlapping benchmarks to declare a winner yet · Gemini 3.5 Flash · GPT-5.1-Codex are still filling in scores.
Hype vs Reality
Attention vs performance
Gemini 3.5 Flash
#44 by perf·no signal
GPT-5.1-Codex
#27 by perf·no signal
Best value
GPT-5.1-Codex
1.0x better value than Gemini 3.5 Flash
Gemini 3.5 Flash
11.9 pts/$
$5.25/M
GPT-5.1-Codex
12.2 pts/$
$5.63/M
Vendor risk
Who is behind the model
Google DeepMind
$4.00T·Tier 1
OpenAI
$840.0B·Tier 1
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| $1.50 | $9.00 | 1.0M tokens (~524 books) | $33.75 | |
| $1.25 | $10.00 | 400K tokens (~200 books) | $34.38 |
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