Compare · ModelsLive · 2 picked · head to head
Claude Opus 4.8 (Fast) vs Claude Sonnet 5.5
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 Opus 4.8 (Fast)
no bench·#9 by attention
Claude Sonnet 5.5
#11 by perf·#10 by attention
Best value
Claude Sonnet 5.5
Claude Opus 4.8 (Fast)
n/a
$30.00/M
Claude Sonnet 5.5
12.5 pts/$
$6.00/M
Vendor risk
Who is behind the model
Anthropic
$965.0B·Tier 1
Anthropic
$965.0B·Tier 1
Head to head
1 benchmark · 2 models
Claude Opus 4.8 (Fast)Claude Sonnet 5.5
Artificial Analysis · Quality Index
Claude Sonnet 5.5 leads by +0.3
Claude Opus 4.8 (Fast)
55.7
Claude Sonnet 5.5
56.0
Full benchmark table
| Benchmark | Claude Opus 4.8 (Fast) | Claude Sonnet 5.5 |
|---|---|---|
Artificial Analysis · Quality Index | 55.7 | 56.0 |
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| $10.00 | $50.00 | 1.0M tokens (~500 books) | $200.00 | |
| $2.00 | $10.00 | 1.0M tokens (~500 books) | $40.00 |
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