MajorAnthropicDeprecationclaude-haiku-4.5Verified
Anthropic introduces Claude Fable 5.1, replacing Fable 5
Anthropic's model overview now lists Claude Fable 5.1 as the top-tier model for demanding reasoning and long-horizon agentic work, replacing Claude Fable 5. The new model has a knowledge cutoff of Jun 2026 (vs Jan 2026 for Fable 5). API ID is claude-fable-5-1. This is a new model launch, not a break
Sep 1, 2026 (UTC)Views:3
Impact Assessment
Cost1
Reliability0
Migration2
Quality3
Compliance0
Alternative models
Directional candidates based on stored listed rates and editorial scenario tags; validate quality and current terms before switching
Candidates with lower listed rates
Mistral NemoMistral
Significant cost savings
$0.02 / $0.03
Stored listed rate / 1M tokens
Listed average about 99% lower
Mistral Nemoopenrouter
Significant cost savings
$0.03 / $0.03
Stored listed rate / 1M tokens
Listed average about 99% lower
Llama Prompt Guard 2 22MGroq
Significant cost savings
$0.03 / $0.03
Stored listed rate / 1M tokens
Listed average about 99% lower
Qwen3-ASR FlashQwen
Significant cost savings
$0.04 / $0.04
Stored listed rate / 1M tokens
Listed average about 99% lower
Voxtral Mini 3B 2507AWS Bedrock
Significant cost savings
$0.04 / $0.04
Stored listed rate / 1M tokens
Listed average about 99% lower
Sources
docs
Anthropic Models Docs
Models overview Claude Fable 5.1
Comments
Loading comments...
AI Cost Optimization
Does this change your best option?
Check your models and usage for free. See the relevant official changes, estimated cost, and a practical next step.