Claude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback)

Anthropic

Frontier ModelReasoningVision ModelProprietary

Analysis of Anthropic's Claude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback) and comparison to other AI models across key metrics including quality, price, performance (tokens per second & time to first token), context window & more.

Context

Release Date: Jun 09, 2026
Window: 1M

PricingPer 1M tokens

Input: $10
Output: $50
Blended 3:1: $20

Capabilities

Speed: 63 t/s
Input
Output
Reasoning tokens

Latency

TTFT: 137.53 ms
500 token response: 145.43 s

Benchmarks

Reasoning: ●●●○○
Coding: ●●●○○
GPQA: 92.6%
HLE: 53.3%
SciCode: 60.2%

Analysis of Anthropic's Claude Fable 5 (Adaptive Reasoning, Max Effort, Opus 4.8 Fallback) and comparison to other AI models across key metrics including quality, price, performance (tokens per second & time to first token), context window & more.