RankingTerminal-Bench-Science · 0.1

Terminal-Bench-Science · 0.1

Data updated 24 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

The available records have no admitted matched comparison in the capability core. Raw results remain available below.

Compare published benchmark results with category weights →

Models

Published configurations retain their source and harness labels. Missing results remain unknown.

1–5 of 5 entries

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 2026-09-24	Claude Fable 5.1 and Claude Mythos 5.1 System Card	lab self-report	2026-09-24
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 2026-09-24	Claude Fable 5.1 and Claude Mythos 5.1 System Card	lab self-report	2026-09-24
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 2026-09-24	Claude Fable 5.1 and Claude Mythos 5.1 System Card	lab self-report	2026-09-24
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 2026-09-24	Claude Fable 5.1 and Claude Mythos 5.1 System Card	lab self-report	2026-09-24
Claude Opus 5.5Anthropic	58.7% Reported settings & source Claude Code --bare; max thinking effort; safeguards enabled with server-side fallback (3.9% of requests, 5% of trials); 10 trials per task (700 trials) on 70 tasks. Provider-published lab self-report from the Claude Opus 5.5 system card (SHA256 7311c9c6bbb16d012f1c12c7418b05949fcf7ae3e30d2c40f22050074b2a7378). Not an independent board. The Anthropic launch grid at https://www.anthropic.com/claude-opus-5-5 shows 58.7%. Comparison limit: Provider-published lab self-report. Shown as a labeled claim and not admitted as a matched board comparison. Claude Opus 5.5 System Card · Table 8.1.A; section 8.6 · reviewed 2026-09-22	Claude Opus 5.5 System Card	lab self-report	2026-09-22