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I should like to know how much this would cost? Even Claude's largest subscription appears insufficient for such token requirements.

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I ran a cost estimate on the project I describe in https://simonwillison.net/2025/Oct/23/claude-code-for-web-vi... - which was covered by my Claude Max account, but I dug through the JSONL log files for that session to try and estimate the cost if I had been using the API.

The cost estimate came out to 63 cents - details here: https://gistpreview.github.io/?27215c3c02f414db0e415d3dbf978...

What are you doing to keep a JSONL per session? Or is this something built in? I’m interested in estimating token costs in this way.

It's built in - the ~/.claude/projects folder stores the JSONL for 30 days or you can extend the retention time like this: https://simonwillison.net/2025/Oct/22/claude-code-logs/

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