Model Mix Skill for Claude
> Break down Claude Code usage by model family (Opus / Sonnet / Haiku) from the Agent Monitor dashboard — each family's share of tokens, share of cost, and the spots where an expensive model is doing cheap work. Pulls per-model token and cost splits from /api/pricing/cost, current rates from /api/pricing, fleet token totals from /api/analytics, and per-session model assignment from /api/sessions. Use when deciding model routing or whether to downshift work to a cheaper tier.
Install
one command, takes just this skill from the repositorynpx skills add https://github.com/hoangsonww/Claude-Code-Agent-Monitor --skill model-mixThe instruction itself
11 sections, as written by the authorModel Mix
See where your tokens and dollars go by model family, and where to re-route work.
Input
The user provides: $ARGUMENTS
This may be: empty (analyze the whole fleet), "today" / "this week" / a date range, or a focus like "where is Opus overused?". When empty, analyze all data from /api/pricing/cost and /api/sessions.
Data Sources
| Endpoint | Returns |
|----------|---------|
| GET /api/pricing/cost | { total_cost, breakdown: [{ model, input_tokens, output_tokens, cache_read_tokens, cache_write_tokens, cost, matched_rule }] } — per-model token and cost split |
| GET /api/pricing | { pricing: [{ model_pattern, display_name, input_per_mtok, output_per_mtok, cache_read_per_mtok, cache_write_per_mtok }] } — rates per family |
| GET /api/analytics | tokens totals (total_input, total_output, total_cache_read, total_cache_write — baselines pre-summed), agent_types for delegation context |
| GET /api/sessions?limit=200 | Session list — model, cwd, started_at, ended_at, inline cost, metadata (JSON: thinking_blocks, turn_count, total_turn_duration_ms, usage_extras) |
How families and rates work
Map each model in the cost breakdown to a family from its matched_rule / display_name:
| Family | Input $/Mtok | Output $/Mtok | Cache Read $/Mtok | Cache Write $/Mtok |
|--------|-------------|--------------|-------------------|-------------------|
| Opus 4.5/4.6 | $5 | $25 | $0.50 | $6.25 |
| Sonnet 4/4.5/4.6 | $3 | $15 | $0.30 | $3.75 |
| Haiku 4.5 | $1 | $5 | $0.10 | $1.25 |
cost = (tokens / 1M) × rate_per_mtok summed over the 4 token types; longest model_pattern wins. Opus output costs ~5× Sonnet and ~5× Haiku per token, so a family's cost share routinely exceeds its token share — that gap is the routing signal.
Report Sections
1. Token Share by Family
Aggregate input + output + cache_read + cache_write tokens per family from /api/pricing/cost. Show each family's tokens and percent of total. Cross-check the grand total against /api/analytics token totals.
2. Cost Share by Family
Sum cost per family. Show each family's dollar total and percent of total_cost. Place the cost-share % next to the token-share % so the premium gap is visible.
3. Cost-vs-Token Gap
For each family compute cost_share − token_share. A large positive gap on Opus/Sonnet signals premium spend concentration. Rank families by gap.
4. Expensive Model on Cheap Work
From /api/sessions?limit=200, find Opus/Sonnet sessions with signals of low complexity: low turn_count, short total_turn_duration_ms, few thinking_blocks, or small token footprints. List candidates that could plausibly run on a cheaper tier, with current cost and estimated cost if downshifted.
5. Routing Recommendations
- Quantify the savings of moving each candidate workload to the next-cheaper family (recompute cost at that family's rates).
- Note work that genuinely needs Opus (deep reasoning, long context) and should stay.
- Summarize a suggested routing policy (e.g. Haiku for mechanical edits, Sonnet for default dev, Opus for hard reasoning).
Output
Structured Markdown with tables. Currency as USD to 4 decimal places; rates as $/Mtok; token shares and cost shares as percentages; use ▲/▼ for the cost-vs-token gap and any trend. Token counts with thousands separators.
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How to use it
Take hoangsonww/model-mix from the repository into ~/.claude/skills for personal
use, or into .claude/skills inside a project.
The agent identifies a skill by the name field in its header. Two skills with the
same name cannot sit side by side — one of them will be ignored.