Compare · ModelsLive · 2 picked · head to head
Claude Opus 5.5 vs Step 3.5 Flash
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
Claude Opus 5.5 wins on 1/1 benchmarks
Claude Opus 5.5 wins 1 of 1 shared benchmarks. Leads in speed.
Category leads
speed·Claude Opus 5.5
Hype vs Reality
Attention vs performance
Claude Opus 5.5
#3 by perf·#6 by attention
Step 3.5 Flash
#8 by perf·no signal
Best value
Step 3.5 Flash
56.1x better value than Claude Opus 5.5
Claude Opus 5.5
6.9 pts/$
$12.00/M
Step 3.5 Flash
384.5 pts/$
$0.20/M
Vendor risk
Mixed exposure
One or more vendors flagged
Anthropic
$965.0B·Tier 1
StepFun
$5.0B·Tier 1
Head to head
1 benchmark · 2 models
Claude Opus 5.5Step 3.5 Flash
Artificial Analysis · Quality Index
Claude Opus 5.5 leads by +19.8
Claude Opus 5.5
57.6
Step 3.5 Flash
37.8
Full benchmark table
| Benchmark | Claude Opus 5.5 | Step 3.5 Flash |
|---|---|---|
Artificial Analysis · Quality Index | 57.6 | 37.8 |
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| $4.00 | $20.00 | 1.0M tokens (~500 books) | $80.00 | |
| $0.10 | $0.30 | 262K tokens (~131 books) | $1.50 |