Compare · ModelsLive · 2 picked · head to head
GPT-5.1-Codex vs Step 3.5 Flash
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
Step 3.5 Flash wins on 0/0 benchmarks
Not enough overlapping benchmarks to declare a winner yet · GPT-5.1-Codex · Step 3.5 Flash are still filling in scores.
Hype vs Reality
Attention vs performance
GPT-5.1-Codex
#21 by perf·no signal
Step 3.5 Flash
#7 by perf·#11 by attention
Best value
Step 3.5 Flash
31.5x better value than GPT-5.1-Codex
GPT-5.1-Codex
12.2 pts/$
$5.63/M
Step 3.5 Flash
384.5 pts/$
$0.20/M
Vendor risk
Mixed exposure
One or more vendors flagged
OpenAI
$840.0B·Tier 1
StepFun
$5.0B·Tier 1
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| GPT-5.1-Codex | $1.25 | $10.00 | 400K tokens (~200 books) | $34.38 |
| Step 3.5 Flash | $0.10 | $0.30 | 262K tokens (~131 books) | $1.50 |
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