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Boris Cherny

Works at a lab
Last updated: Sep 1, 2026
RoleCreator and Head of Claude Code, Anthropic
EarnsWorks at a lab
Sources14 cited fields · high confidence
@bchernybchernycode.claude.com

Claude Code with Fable 5.1 at xhigh for everything; five parallel terminal sessions, Artifacts for diagrams and dashboards.

“My setup might be surprisingly vanilla!” x.com

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Loadout

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Boris Cherny’s loadout

Works at a lab
Harness
Claude Code
Boris refers to Fable 5 as available in Claude Code and Cowork; his current coding harness remains Claude Code.
Model
Claude Fable 5.1
xhigh
Terminal
Terminal
Five numbered sessions in the MacBook terminal; system notifications when one needs input.
ToolsClaude Code Artifacts+4 more

4 views · 0 equipped

Models

Claude Fable 5.1xhigh
Boris says Fable 5.1 is his best model yet and that he has been using it for everything.
x.com, 2026-09 ↗

Editor & terminal

Terminal
Five numbered sessions in the MacBook terminal; system notifications when one needs input.
infoq.com, 2026-01 ↗

Tools

Claude Code Artifacts
Uses Artifacts for visual explanations, system diagrams, animation previews, data analyses and dashboards.
x.com, 2026-06 ↗
Slack MCP
Searches and posts to Slack; configuration is shared in .mcp.json.
x.com, 2026-01 ↗
BigQuery via bq CLI
Runs analytics queries through the command line.
x.com, 2026-01 ↗
Sentry
Uses Claude Code to retrieve error logs.
x.com, 2026-01 ↗
Claude Chrome extension
Tests UI changes in a browser and iterates until the UX works.
x.com, 2026-01 ↗

Workflow

  1. 1Use Fable 5.1 across coding, analysis, design and long-running agentic work.x.com, 2026-09
  2. 2Start most sessions in Plan mode, refine the plan, then switch to auto-accept edits.x.com, 2026-01
  3. 3Use checked-in slash commands for repeated inner-loop work, including commit, push, and PR creation.x.com, 2026-01
  4. 4Use subagents for simplification and end-to-end verification.x.com, 2026-01
  5. 5Give every task a feedback loop that lets Claude verify the result.x.com, 2026-01

Timeline

  1. 2026-09-01ModelClaude Fable 5.1x.com, 2026-09
  2. 2026-09-01Effortxhighx.com, 2026-09
  3. 2026-06-18ToolsClaude Code Artifactsx.com, 2026-06
  4. 2026-06-09HarnessClaude Codex.com, 2026-06
  5. 2026-01-10TerminalTerminalinfoq.com, 2026-01
  6. 2026-01-03ToolsSlack MCPx.com, 2026-01
  7. 2026-01-03ToolsBigQuery via bq CLIx.com, 2026-01
  8. 2026-01-03ToolsSentryx.com, 2026-01
  9. 2026-01-03ToolsClaude Chrome extensionx.com, 2026-01

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