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RankingTerminal-Bench-Science · 0.1

Terminal-Bench-Science · 0.1

Data updated 12 Sept 2026

Bucket: Coding
Unit: percent
Direction: Higher is better
Version: 0.1
Display harness: Claude Fable 5.1 and Claude Mythos 5.1 System Card
Board: https://www.anthropic.com/claude-fable-5-1-mythos-5-1-system-card

Compare published benchmark results with category weights →

Models

Model	Score	Harness	Evidence	Source-recorded date
Claude Fable 5.1Anthropic	52.6% Reported settings & source 70tasks; Claude Code --bare max; Fable10trials/task, Opus12; GPT Codex CLI max from public board. Fable is the safeguarded deployed configuration; selected tasks may use disclosed Opus fallback, except evaluations explicitly counting safety blocks as failures. Claude Fable 5.1 and Claude Mythos 5.1 System Card · 8.7 · reviewed 2026-09-12	Claude Fable 5.1 and Claude Mythos 5.1 System Card	lab self-report	2026-09-12
Claude Opus 5Anthropic	29% Reported settings & source 70tasks; Claude Code --bare max; Fable10trials/task, Opus12; GPT Codex CLI max from public board. Claude Fable 5.1 and Claude Mythos 5.1 System Card · 8.7 · reviewed 2026-09-12	Claude Fable 5.1 and Claude Mythos 5.1 System Card	lab self-report	2026-09-12
Claude Fable 5Anthropic	24.7% Reported settings & source 70tasks; Claude Code --bare max; Fable10trials/task, Opus12; GPT Codex CLI max from public board. Fable is the safeguarded deployed configuration; selected tasks may use disclosed Opus fallback, except evaluations explicitly counting safety blocks as failures. Claude Fable 5.1 and Claude Mythos 5.1 System Card · 8.7 · reviewed 2026-09-12	Claude Fable 5.1 and Claude Mythos 5.1 System Card	lab self-report	2026-09-12
GPT-5.6 SolOpenAI	22.4% Reported settings & source 70tasks; Claude Code --bare max; Fable10trials/task, Opus12; GPT Codex CLI max from public board. Claude Fable 5.1 and Claude Mythos 5.1 System Card · 8.7 · reviewed 2026-09-12	Claude Fable 5.1 and Claude Mythos 5.1 System Card	lab self-report	2026-09-12