Feat/cost

[akshatshaw]

--cost — Estimated cost breakdown by model
What :
Adds a new --cost flag that calculates and displays estimated API costs per model, broken down by input, output, cache read, and cache write tokens.

Pricing is local — no API calls. Prices are hardcoded from official public pricing pages with prefix/substring matching for versioned model names. Unknown models fall back to Sonnet-tier pricing.

enrichFromStatsCache()
— JSONL parsing gives proportional estimates, but

stats-cache.json
has authoritative per-model token breakdowns including cacheCreationInputTokens. We use that when available for accuracy.
Non-breaking — --cost is opt-in. Without it, output is identical to before.

tokenviz --claude --cost
💰 ESTIMATED COST
MODEL INPUT OUTPUT CACHE READ CACHE WRITE TOTAL
claude-opus-4-6 $0.37 $5.65 $33.9 $59.7 $99.5
claude-sonnet-4-6 $0.03 $1.58 $4.06 $5.48 $11.2
claude-haiku-4-5-20251001 $0.006 $0.18 $0.63 $0.83 $1.66
TOTAL $116
Works in both terminal and exported PNG/SVG.

[akshatshaw]

@harshkedia177 i have added support to get estimated cost for claude code usage, have a look and merge