Claude Usage
Ground-truth token usage and cost reporting for Claude Code sessions. Parses JSONL files directly—parent sessions and subagent sidechains—to produce accurate numbers.
Why This Exists
ccusage (v18+, the standard community tool with 10.6k stars) undercounts output tokens by 77-94% for heavy users:
| Source | Output Tokens | Notes |
|---|---|---|
| Raw JSONL (all files) | 1,076,691 | Ground truth |
| Raw JSONL (date-filtered) | 412,987 | Properly filtered |
| ccusage --timezone UTC | 93,960 | 77% undercount |
| ccusage default | 62,375 | 94% undercount |
Three compounding bugs:
- Ignores subagent files at
{session-uuid}/subagents/{agent-id}.jsonl—132 files missed on a typical day with Agent Teams - Timezone confusion between UTC entry timestamps and local time filtering
- Drops entries in parent files—even at UTC, reports only 23% of actual tokens
This script reads every JSONL file to produce correct totals.
Usage
# Today's usage (default)
python3 ~/.claude/skills/claude-usage/scripts/claude_usage.py
# Last 7 days, broken down by day
python3 ~/.claude/skills/claude-usage/scripts/claude_usage.py --since 7d
# Weekly breakdown for the past month
python3 ~/.claude/skills/claude-usage/scripts/claude_usage.py --by week --since 30d
# Per-model breakdown
python3 ~/.claude/skills/claude-usage/scripts/claude_usage.py --by model --since 7d
# Per-session with human-readable summaries
python3 ~/.claude/skills/claude-usage/scripts/claude_usage.py --by session --since 1d
# Per-project breakdown
python3 ~/.claude/skills/claude-usage/scripts/claude_usage.py --by project --since 7d
# Filter to one project
python3 ~/.claude/skills/claude-usage/scripts/claude_usage.py --project Thera --since 30d
# Custom date range
python3 ~/.claude/skills/claude-usage/scripts/claude_usage.py --since 2026-02-01 --until 2026-02-28
# JSON output (pipe to jq)
python3 ~/.claude/skills/claude-usage/scripts/claude_usage.py --since 7d --json | jq '.grand_total'
# CSV output
python3 ~/.claude/skills/claude-usage/scripts/claude_usage.py --since 7d --csv
# Compare against ccusage (shows delta)
python3 ~/.claude/skills/claude-usage/scripts/claude_usage.py --compare
# PDF report (dark editorial, CTO-ready)
python3 ~/.claude/skills/claude-usage/scripts/claude_usage_report.py --since 30d
# PDF with custom output path
python3 ~/.claude/skills/claude-usage/scripts/claude_usage_report.py --since 30d -o ~/Desktop/feb-usage.pdf
# HTML only (no Playwright needed)
python3 ~/.claude/skills/claude-usage/scripts/claude_usage_report.py --since 7d --html
Output Columns
| Column | Description |
|---|---|
| Input | Prompt tokens (charged at input rate) |
| Output | Response tokens (most expensive category) |
| CacheW | Cache write tokens (cache_creation_input_tokens) |
| CacheR | Cache read tokens (significantly cheaper than input) |
| Total | Sum of all four token types |
| Cost | Estimated USD from the hardcoded pricing table |
Aggregation Modes (--by)
| Mode | Groups by | Example key |
|---|---|---|
day (default) | Calendar date in local timezone | 2026-02-20 |
week | ISO week number | 2026-W08 |
month | Month | 2026-02 |
session | Session UUID (resolved to summary from sessions-index.json) | 8a6c801a Working on Claudicle... |
model | Model name | claude-opus-4-6 |
project | Project directory (decoded to path) | ~/Desktop/Programming |
Pricing Table
Prices are hardcoded in the PRICING dict at the top of claude_usage.py. Update when Anthropic changes rates. Keys are model name substrings matched most-specific-first.
Current defaults (USD per million tokens, verified 2026-02-21):
| Model | Input | Output | Cache Write (1h) | Cache Read |
|---|---|---|---|---|
| Opus 4.5 / 4.6 | $5.00 | $25.00 | $10.00 | $0.50 |
| Opus 4.0 / 4.1 | $15.00 | $75.00 | $30.00 | $1.50 |
| Sonnet 4.x | $3.00 | $15.00 | $6.00 | $0.30 |
| Haiku 4.5 | $1.00 | $5.00 | $2.00 | $0.10 |
| Sonnet 3.7 / 3.5 | $3.00 | $15.00 | $6.00 | $0.30 |
| Haiku 3.5 | $0.80 | $4.00 | $1.60 | $0.08 |
| Opus 3 | $15.00 | $75.00 | $30.00 | $1.50 |
| Haiku 3 | $0.25 | $1.25 | $0.50 | $0.03 |
Cache write column shows the 1-hour rate (2x base input). Claude Code uses 1-hour prompt caching exclusively. The 5-minute rate (1.25x base input) is also supported when the JSONL cache_creation sub-object provides a TTL split.
Timezone Handling
JSONL timestamps are UTC. The script converts to the system's local timezone (or --tz America/New_York) before applying --since/--until filters. This prevents the midnight-boundary confusion that causes ccusage to drop entries when the UTC date differs from the local date.
Data Sources
JSONL files at ~/.claude/projects/{encoded-path}/:
- Parent sessions:
{session-uuid}.jsonl - Subagent sidechains:
{session-uuid}/subagents/{agent-id}.jsonl - Session metadata:
sessions-index.json(summaries for--by session)
The script uses streaming line-by-line reads (O(1) memory) to handle files exceeding 300MB.
PDF Reports
claude_usage_report.py generates a dark editorial PDF with Crimson Pro + JetBrains Mono typography, gold Minoan accents, bar charts, model distribution with color-coded stacked bars, token composition breakdown, and detailed tables. Designed for executive sharing.
Requires Playwright (uv pip install --system playwright && playwright install chromium). Uses Chromium for pixel-perfect CSS rendering—same engine as the Aldea Slide Deck skill. Falls back to HTML output with --html flag.
Caveats
- Estimated accuracy: ~95%. The remaining gap comes from data residency multipliers (1.1x for US-only inference, not tracked) and potential edge cases in streaming chunk boundaries.
- Streaming chunks are deduplicated by message ID using last-wins strategy—
output_tokensmonotonically increases across chunks, so only the final chunk per message ID has the correct value. Without dedup, costs were overcounted by 2-5x. - Cost is estimated from the pricing table. Anthropic billing may differ due to batch discounts or promotional pricing.
- Cache write pricing uses the 1-hour rate by default (Claude Code's caching mode). When JSONL provides
cache_creation.ephemeral_5m_input_tokens/ephemeral_1h_input_tokens, rates are split accordingly. - Synthetic entries (
model: "<synthetic>") and billing error entries (all-zero token counts) are automatically filtered. - Malformed JSON lines and duplicate streaming chunks are counted and reported in the output footer.
- Requires Python 3.9+ for
zoneinfomodule. - PDF reports require Playwright with Chromium (
playwright install chromium). Includes a Pricing Methodology section with full rate table, formula, and confidence badge.