ctxdexSynthetic model data for learning

Benchmark definition

BIG-Bench Hard (BBH)

ActiveEstablishedCommon useBBH

A suite of 23 challenging BIG-bench tasks selected because prior evaluated language models did not outperform average human raters.

Applicability does not mean evaluated; benchmark result/model score data is outside this UI contract.

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About

Description
BBH focuses on 23 BIG-bench tasks that were especially challenging at the time of construction and are often used to probe multi-step reasoning.
What it measures
Diverse multi-step reasoning abilities across 23 tasks.
What it does not measure
It is a heterogeneous suite rather than a single coherent capability measure, and results depend materially on prompting methodology.
Comparison guidance
Not published
Intended difficulty
Not published

Not recorded for this benchmark: why it matters, motivation, gap addressed.

Classification

Categories
General reasoning
Domains
General academic
Evaluation style
Automatic reference matchStatic Q&A

Structure

1 component. Applicability can differ between them.

Components

  • 23 BBH tasksSectionThe official suite contains 23 challenging BIG-bench tasks.

Tasks

BBH task suite

Metrics

What a result on this benchmark would be reported as. ctxdex does not carry results.

MetricRoleDirectionUnit
Accuracy
PrimaryHigher is betterPercent

Methodology

BBH prompting variantsThis definition

Official/reference evaluations include few-shot and chain-of-thought variants; these belong to methodology, not benchmark identity.

Evaluation environment

What the benchmark's harness provides and allows. These are properties of the environment, not model requirements, and applicability does not test for them.

Interaction

None. Static prompts and answers.

Evaluation style
Automatic reference match, Static Q&A
Environment summary
Not published

Model requirements

Required conditions decide applicability. Relevant ones describe what the benchmark exercises and decide nothing.

Required · decides applicability

Whole benchmark
Text (input)Text (output)Complex reasoning

Relevant · informational

Explicit reasoningGeneral purpose modelsReasoning models

CTXDEX models

13 of the 58 active, preview, experimental models meet this benchmark’s recorded requirements, at some scope. Applicable means the requirements are met, not that the model was evaluated.

View all 13 applicable models →
Applicable · full
13
Applicable · components
0
Applicable · scenarios
0
Conditionally applicable
0
Not recorded
45

Counted over 58 models in the default lifecycle scope (active, preview, experimental).

Every required condition, for the whole benchmark, is recorded as supported. Each line is one recorded condition and why it counts.

  • Ctxdex Chintana 1 Large
    Ctxdex Efficient Reasoning
    Full benchmark

    Every one of the 3 required conditions is recorded as supported.

    • MODALITY:INPUT:TEXTthe catalogue records SUPPORTED for TEXT (input)
    • MODALITY:OUTPUT:TEXTthe catalogue records SUPPORTED for TEXT (output)
    • MODEL_TASK:COMPLEX_REASONINGthe catalogue records SUPPORTED for COMPLEX_REASONING
  • Ctxdex Chintana 1 Mini
    Ctxdex Efficient Reasoning
    Full benchmark

    Every one of the 3 required conditions is recorded as supported.

    • MODALITY:INPUT:TEXTthe catalogue records SUPPORTED for TEXT (input)
    • MODALITY:OUTPUT:TEXTthe catalogue records SUPPORTED for TEXT (output)
    • MODEL_TASK:COMPLEX_REASONINGthe catalogue records SUPPORTED for COMPLEX_REASONING
Preview holds 12 of 13. View all →

Applicability/relevance ordering only; never a performance ranking.

Scale

  • 23
    Task
    Total · Exact

Data and access

Dataset
Open
Evaluation code
Open source
Unknown
Leaderboard, Peer review, Maintenance

Coverage

Languages, regions

None recorded

Coverage summary
Not published

Limitations

None recorded

Lineage

Family
FamilyBIG-bench
Related
Inverse of successor of BenchmarkBIG-Bench Extra Hard (BBEH)
Subset of BenchmarkBIG-bench
Other definitions in family
BIG-Bench Extra Hard (BBEH) ActiveBIG-bench Active
Changes

None recorded

Sources

Freshness

Content version
1.0
Last reviewed
2026-09-22
Refresh model
Static
Time sensitivity
Low
Benchmark data
c40cccac878af5d0

13 contract fields are empty for every benchmark in this release and are not shown: applicability groups, conditional requirements, feature requirements, model relevance domains, required capabilities, openness summary, reference artifacts, interaction protocols, tool protocols, benchmark last major refresh at, short name, target expertise level, target population.