Compare · ModelsLive · 2 picked · head to head
Claude Fable 5 vs Step 3.5 Flash
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
Claude Fable 5 wins on 4/4 benchmarks
Claude Fable 5 wins 4 of 4 shared benchmarks. Leads in speed · arena.
Category leads
speed·Claude Fable 5arena·Claude Fable 5
Hype vs Reality
Attention vs performance
Claude Fable 5
#12 by perf·no signal
Step 3.5 Flash
#9 by perf·#11 by attention
Best value
Step 3.5 Flash
155.0x better value than Claude Fable 5
Claude Fable 5
2.5 pts/$
$30.00/M
Step 3.5 Flash
384.5 pts/$
$0.20/M
Vendor risk
Mixed exposure
One or more vendors flagged
Anthropic
$380.0B·Tier 1
StepFun
$5.0B·Tier 1
Head to head
4 benchmarks · 2 models
Claude Fable 5Step 3.5 Flash
Artificial Analysis · Agentic Index
Claude Fable 5 leads by +0.8
Artificial Analysis Agentic Index · a composite score measuring how well a model performs in agentic workflows · multi-step tool use, planning, error recovery, and autonomous task completion. Aggregates results from multiple agentic benchmarks including SWE-bench, tool-use tests, and planning evaluations. The canonical single-number metric for "how good is this model as an agent?"
Claude Fable 5
52.8
Step 3.5 Flash
52.0
Artificial Analysis · Coding Index
Claude Fable 5 leads by +44.8
Artificial Analysis Coding Index · a composite score that aggregates performance across multiple coding benchmarks into a single index. Tracks code generation quality, debugging ability, multi-language competence, and real-world software engineering tasks. Used by Artificial Analysis to rank model coding capability in a normalized, comparable format. Useful for developers choosing between models for coding-heavy workloads.
Claude Fable 5
76.5
Step 3.5 Flash
31.6
Artificial Analysis · Quality Index
Claude Fable 5 leads by +22.1
Claude Fable 5
59.9
Step 3.5 Flash
37.8
Chatbot Arena Elo · Overall
Claude Fable 5 leads by +112.4
Claude Fable 5
1507.6
Step 3.5 Flash
1395.2
Full benchmark table
| Benchmark | Claude Fable 5 | Step 3.5 Flash |
|---|---|---|
Artificial Analysis · Agentic Index Artificial Analysis Agentic Index · a composite score measuring how well a model performs in agentic workflows · multi-step tool use, planning, error recovery, and autonomous task completion. Aggregates results from multiple agentic benchmarks including SWE-bench, tool-use tests, and planning evaluations. The canonical single-number metric for "how good is this model as an agent?" | 52.8 | 52.0 |
Artificial Analysis · Coding Index Artificial Analysis Coding Index · a composite score that aggregates performance across multiple coding benchmarks into a single index. Tracks code generation quality, debugging ability, multi-language competence, and real-world software engineering tasks. Used by Artificial Analysis to rank model coding capability in a normalized, comparable format. Useful for developers choosing between models for coding-heavy workloads. | 76.5 | 31.6 |
Artificial Analysis · Quality Index | 59.9 | 37.8 |
Chatbot Arena Elo · Overall | 1507.6 | 1395.2 |
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 | |
| $0.10 | $0.30 | 262K tokens (~131 books) | $1.50 |