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Agent configuration · Terminal-Bench 2.1

Claude Code · Fable 5 · xhigh

The ranked object: model, scaffold, tools, permissions, budget, and environment together.

Official accessOpen source
Task accuracy83.8%
Cost per successful taskNot published
Published result range±1.2%

01

Configuration

Agent systemClaude Code · Fable 5 · xhigh
Base modelFable 5
Source model ID or labelFable 5
ScaffoldClaude Code
Scaffold versionNot reported
ToolsTerminal shell
EnvironmentHarbor-managed terminal environments
BudgetFixed limits · at least 5 trials per task

02

Outcome

Task accuracy83.8%
Partial scoreNot published
Cost per successful taskNot published
Reported benchmark cost$552.67
Median completion timeNot published
Human interventionNot published

03

Operation

Repeat-run evidenceNot published
Published result range±1.2%
Safety noteNot published
Comparability groupterminal-bench-2-1-main
Evaluation date
Data captured

04

Trust

EvidenceListed by the benchmark publisher
SourceTerminal-Bench 2.1
Source snapshotTerminal-Bench 2.1 · publisher-verified leaderboard · Jul 30, 2026
Last checkedJul 30, 2026
Tasks89 terminal tasks
Evidence levelPublisher maintained
Evidence note

The Terminal-Bench team says it ran and verified these submissions. Its 2.1 release revised tasks and the evaluation environment.

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What this result does not prove

This result applies to the exact system and source conditions shown here. It does not establish a universal best agent, production reliability, data governance, or performance on a different benchmark version.

Compare like with like

Only configurations from the same benchmark version and task scope can be placed in one comparison.

Terminus 2 · Fable 5 · high80.4% · Fable 5Claude Code · Opus 4.8 · high78.9% · Opus 4.8

Source-reported data; missing values remain unknown.

Validate before adoption

Public rankings create a shortlist. A small private trial decides whether the configuration fits your work.

  1. 1

    Choose 10–20 representative tasks and define a clear pass condition.

  2. 2

    Lock the agent, model, tools, permissions, and budget before testing.

  3. 3

    Run each important task more than once; record success, cost, time, and takeovers.

  4. 4

    Review failures and data-handling risks before a production decision.

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