datasette 1.0a33

Simon Willison · Simon Willison · 2026-06-11

Simon Willison releases Datasette 1.0a33, extending the JSON extras API pattern to queries and rows as a significant step toward a stable 1.0, and uses Claude Fable 5 for planning and GPT-5.5 for implementation to build a custom API explorer demonstrating the feature.

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Appears in

Anthropic Launches Claude Fable 5 and Mythos 5: Agentic Capability Leap and Tiered Access

Extraction

Topics: datasetteapi-designai-assisted-programmingopen-source-software

Claims

Datasette 1.0a33 extends the ?_extra= JSON API pattern from tables to cover queries and rows, representing a significant milestone toward the stable 1.0 release.
Willison used Claude Fable 5 in Claude Code for planning and GPT-5.5 in Codex Desktop for implementation, demonstrating a split-responsibility multi-model AI-assisted workflow.
API explorer tooling has become cheap enough to build with AI assistance that Willison describes them as 'almost free to build.'

Key quotes

This alpha is a significant step on the road to a stable 1.0, finally extending the ?_extra= pattern I introduced in Datasette 1.0a3 to cover queries and rows in addition to tables.

Because API explorer tools are almost free to build now I had Claude Fable 5 in Claude Code (for the plan) and GPT-5.5 xhigh in Codex Desktop (for the implementation) build me this custom extras API explorer.