Data Analysis Benchmark (StepFun)

Step 3.5 Flash 39.6% Only in system cards

Agents in Claude Code solve 50 business data-analysis tasks with CSV data. A model grader scores outputs against expert rubrics averaging 26.9 items a task.

In-house StepFun evaluation. The tasks are not public.

Made by StepFun Released Feb 2026 Data science and SQL Tasks kept private Last in a system card Feb 2026 Last model added Feb 2026

Level: Expert Specialists with years of training, often over hours of work
Scored: Graded by a model A language model scores each response, usually against a rubric.
Answers: Agent task Many steps in a terminal, browser, desktop, app, game or robot.

Paper

Model scored in lab cards

System card reports it, from 1 lab

Step 3.5 Flash leads with 39.6%

Best score per model as labs report them in their own cards. Labs pick their own settings, so these compare less cleanly than independent runs.

Bars Table

39.6 Step 3.5 Flash

1 Step 3.5 Flash 39.6%

#	Model	Score	Setting	Date	Source
1	Step 3.5 Flash	39.6%		Feb 2026	Model card

Scores over time

All the scores we have, one dot each, so a model tested at several settings appears more than once.

Reported by the lab in its model card

Labs report it only in system cards

We read the headline results of 479 launch posts from 51 labs, and none of them list this benchmark. Some system cards do, below.

One system card reports it

Besides launch posts, we read the system cards, model cards and technical reports labs publish with a release. They report far more, including safety and frontier-risk tests.

Date	Document	Score	As the document writes it	Section
11 Feb 2026	Step 3.5 Flash technical report	39.6	Data Analysis Benchmark, in-house, Claude Code environment, Avg@3 (Table 19)	Capabilities

Step 3.5 Flash leads with 39.6%

Scores over time

Labs report it only in system cards

One system card reports it

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