Scale Labs SWE Atlas – Test Writing (SWE Atlas – Test Writing)
We show this table for reference; we do not rank on it.
A Scale Labs public leaderboard mirrored as display-only reference data. It does not affect BenchLM rankings.
Scale score on SWE Atlas – Test Writing — September 29, 2026 snapshot
We mirror the published scale score view for SWE Atlas – Test Writing. Fable-5.1 (Claude Code) xHigh* leads the public snapshot at 67.0%, followed by Opus 5 (Claude Code) xHigh (62.2%) and Fable-5 (Claude Code) xHigh* (55.6%). We do not use these results to rank models overall.
Fable-5.1 (Claude Code) xHigh*
Anthropic
Opus 5 (Claude Code) xHigh
Anthropic
Fable-5 (Claude Code) xHigh*
Anthropic
24 modelsCodingCurrentDisplay onlyUpdated September 29, 2026 snapshot
Scale score table (24 models)
ScoreHow to read this leaderboard
Compare the published configurations as complete evaluation systems. The source can combine a base model, agent scaffold, tools, budget, and inference setting in each result.
Operator receipt: 24 sourced rows are currently displayable on this page; the leading published row is Fable-5.1 (Claude Code) xHigh* at 67.0%.
Honest limit: This Scale table is display-only context, not benchmark provenance or a weighted model-only comparison.
How BenchLM shows SWE Atlas – Test Writing
BenchLM mirrors 24 published rows from Scale Labs’ public SWE Atlas – Test Writing leaderboard, captured on September 29, 2026 snapshot.
The table is display only. It is useful context for a published agent or model configuration, but it does not enter BenchLM’s overall or category rankings.
The published SWE Atlas – Test Writing snapshot places Fable-5.1 (Claude Code) xHigh* first at 67.0%. The third row is 11.4 points behind. The broader top-10 range is 25.6 points, so the table still separates the published systems.
24 models have been evaluated on SWE Atlas – Test Writing. The benchmark falls in the Coding category. We keep external benchmark mirrors separate from the weighted global scoring system, so these results remain source-specific evidence. SWE Atlas – Test Writing is currently displayed for reference but excluded from the scoring formula, so it does not directly affect overall rankings.
About SWE Atlas – Test Writing
Year
2026
Tasks
24 published rows
Format
Published Scale leaderboard score
Difficulty
External agent and model evaluation
BenchLM mirrors 24 published rows from the SWE Atlas – Test Writing public table captured on September 29, 2026 snapshot.
Freshness and provenance
Version
SWE Atlas – Test Writing 2026
Refresh cadence
Quarterly
Staleness state
Current
Question availability
Public benchmark set
BenchLM uses freshness metadata to decide whether a benchmark should still be treated as a strong differentiator, a benchmark to watch, or a display-only reference. For the full scoring policy, see the BenchLM methodology page.
Questions
What does SWE Atlas – Test Writing measure?
A Scale Labs public leaderboard mirrored as display-only reference data. It does not affect BenchLM rankings.
Which model leads the published SWE Atlas – Test Writing snapshot?
Fable-5.1 (Claude Code) xHigh* currently leads the published SWE Atlas – Test Writing snapshot with 67.0% scale score. BenchLM shows this benchmark for display only and does not use it in overall rankings.
How many models are evaluated on SWE Atlas – Test Writing?
The September 29, 2026 snapshot snapshot contains 24 AI models.
Know when it’s worth switching models
The model to choose, the cheaper alternative, and the release we would wait on.
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