Model Comparison

Step 5 Preview
vs. Claude Fable 5.1 (Adaptive Reasoning, Max Effort, Default Fallback)

Comparing 2 AI models · 0 benchmarks · StepFun, Anthropic

Recommended Pick

Step 5 Preview7 metric wins

Strongest on: Value, Input price, Output price

Best Value

Step 5 Preview

100.0 value score

43.6 reasoning / $1.43/1M

Lowest Price

Step 5 Preview

$1.00/1M input price

Best Reasoning

Claude Fable 5.1 (Adaptive Reasoning, Max Effort, Default Fallback)

53.4 reasoning score

Blends available reasoning benchmarks

Best for Coding

Claude Fable 5.1 (Adaptive Reasoning, Max Effort, Default Fallback)

81.6 coding index

Differences That Matter

Best value

Step 5 Preview has the strongest quality-to-price mix at 100.0 out of 100 value points.

Price gap

Step 5 Preview is 10x cheaper on input tokens than Claude Fable 5.1 (Adaptive Reasoning, Max Effort, Default Fallback).

Speed gap

Step 5 Preview generates about 1.4x as many tokens per second as Claude Fable 5.1 (Adaptive Reasoning, Max Effort, Default Fallback).

Reasoning gap

Claude Fable 5.1 (Adaptive Reasoning, Max Effort, Default Fallback) leads Step 5 Preview by 9.8 points on reasoning.

Top-pick rationale

Step 5 Preview wins 7 measurable categories, including Value, Input price, Output price, Blended price.

Live compare

Response Face-Off

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Step 5 Preview

StepFun

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Claude Fable 5.1 (Adaptive Reasoning, Max Effort, Default Fallback)

Anthropic

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Full Comparison

Metric	Top Pick St Step 5 Preview StepFun	An Claude Fable 5.1 (Adaptive Reasoning, Max Effort, Default Fallback) Anthropic
Pricing per 1M tokens
Input Cost	$1.00/1M	$10.00/1M
Output Cost	$2.70/1M	$50.00/1M
Blended (3:1)	$1.43/1M	$20.00/1M
Specifications
Organization	StepFun	Anthropic
Release Date	Sep 18, 2026	Sep 1, 2026
Performance & Speed
Throughput	99.8 tok/s	69.0 tok/s
TTFT	2960ms	252290ms
Latency	23010ms	252290ms
Composite Indices
Value Score	100.0	8.7
Reasoning Score	43.6	53.4
Intelligence	43.6	53.4
Coding	—	81.6

Key Takeaways

Step 5 Preview offers the best value at $1.00/1M,making it ideal for high-volume applications and cost-conscious projects.

Claude Fable 5.1 (Adaptive Reasoning, Max Effort, Default Fallback) has the strongest reasoning profile with a 53.4 reasoning score,combining the available reasoning-heavy benchmarks.

Claude Fable 5.1 (Adaptive Reasoning, Max Effort, Default Fallback) reaches a 81.6 coding index,making it the top choice for software development and code generation tasks.

All models support context windows of ∞+ tokens,suitable for processing lengthy documents and maintaining extended conversations.