Fable 5.1 vs 5.0 Model Delta Arena PROD BENCHMARK

"Fable 5.1 is coming in days.... I will die and go to heaven if it beats Fable 5" — @bindureddy

Benchmark Configuration

Evaluation Workload Preset

Prompt / Token Complexity: 64k tokens

Agent Concurrency Stress: 8 Agents

Target Latency Ceiling: 450 ms

Pareto Objective Weight

Model Hypothesis: Fable 5.1 Preview features targeted attention pruning, yielding ~14% lower hallucination in recursive multi-agent states and ~18% faster TTFT.

Projected Performance Deltas (5.1 vs 5.0)

Fable 5.0 Fable 5.1 Preview

+11.2%

Reasoning Coherence

-24.5%

Step Latency

+8.4%

Tool Call Accuracy

-31.0%

Hallucination Rate

Latency vs Reasoning Pareto Frontier Fable 5.1 Dominates Frontier

Execution Trace & Divergence Log 12 Steps Executed

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