Compare · ModelsLive · 2 picked · head to head
Claude Sonnet 5.5 vs Step 3.5 Flash
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
Claude Sonnet 5.5 wins on 1/1 benchmarks
Claude Sonnet 5.5 wins 1 of 1 shared benchmarks. Leads in speed.
Category leads
speed·Claude Sonnet 5.5
Hype vs Reality
Attention vs performance
Claude Sonnet 5.5
#11 by perf·#10 by attention
Step 3.5 Flash
#8 by perf·no signal
Best value
Step 3.5 Flash
30.8x better value than Claude Sonnet 5.5
Claude Sonnet 5.5
12.5 pts/$
$6.00/M
Step 3.5 Flash
384.5 pts/$
$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 Sonnet 5.5Step 3.5 Flash
Artificial Analysis · Quality Index
Claude Sonnet 5.5 leads by +18.2
Claude Sonnet 5.5
56.0
Step 3.5 Flash
37.8
Full benchmark table
| Benchmark | Claude Sonnet 5.5 | Step 3.5 Flash |
|---|---|---|
Artificial Analysis · Quality Index | 56.0 | 37.8 |
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| $2.00 | $10.00 | 1.0M tokens (~500 books) | $40.00 | |
| $0.10 | $0.30 | 262K tokens (~131 books) | $1.50 |