Model Cost Comparison (Starter Pack)
Answer "which model should I use for this, and what will it cost?" with numbers instead of vibes.
When to use
The user describes a task (bulk refactor, deep review, quick lookup, long-context analysis) and wants the cheapest seat that is still adequate.
Steps
- Classify the task. Bucket it: mechanical (rename, format), standard coding, hard reasoning (architecture, security review), long-context (>200K tokens input), or web research.
- Estimate volume. Rough input/output token estimate from the described scope (files touched × average size; state the assumption).
- Price the roster. Using the cost table in CLAUDE.md ($/MTok input/output), compute the estimated cost for each plausible seat: Claude Opus 4.8 ($5/$25), Fable 5 ($10/$50, 1M context, opt-in), Codex GPT-5.5 ($5/$30), Perplexity Sonar Pro ($3/$15), and the included-cost seats (agy, copilot, ollama, cursor-agent) at $0.
- Recommend one seat. Pick the cheapest adequate option and defend it in two sentences. Mechanical work goes to included seats; hard reasoning justifies Opus 4.8 at
xhigh effort; only 1M-context needs or judgment-class calls (ambiguous architecture, API design, product tradeoffs) justify Fable 5 or the claude-sdk seat.
- Check risk surfaces. Regardless of the classification, escalate to a premium Claude seat when the task touches API or schema contracts, security-sensitive code or CI configuration, release artifacts, user-facing UI, a new module, or a breaking change. Cheap-seat agreement never settles a judgment-class decision.
- Show the spread. A three-row table: recommended seat, one cheaper-but-riskier option, one premium option, each with estimated dollars for this task.
Guardrails
- Never recommend Fable 5 or fast-mode Opus by default; both are 2x standard Opus cost and are opt-in only.
- Never recommend Fable 5 for security audits; its safety classifiers can refuse offensive-security phrasing. Security review goes to Opus 4.8 (see
skills/blocks/fable5-prompting.md).
- If the estimate exceeds $1, say so explicitly before any dispatch happens.
Source: hashgraph-online/awesome-codex-plugins → plugins/nyldn/claude-octopus/skills/octopus-starter-pack/model-cost-compare/SKILL.md
1---2name: model-cost-compare3description: Starter: compare model costs for a described task — maps task shape to the cheapest adequate seat and shows the price spread4---5
6
7# Model Cost Comparison (Starter Pack)
8
9Answer "which model should I use for this, and what will it cost?" with numbers instead of vibes.
10
11## When to use
12
13The user describes a task (bulk refactor, deep review, quick lookup, long-context analysis) and wants the cheapest seat that is still adequate.
14
15## Steps
16
171. **Classify the task.** Bucket it: mechanical (rename, format), standard coding, hard reasoning (architecture, security review), long-context (>200K tokens input), or web research.
182. **Estimate volume.** Rough input/output token estimate from the described scope (files touched × average size; state the assumption).
193. **Price the roster.** Using the cost table in CLAUDE.md ($/MTok input/output), compute the estimated cost for each plausible seat: Claude Opus 4.8 ($5/$25), Fable 5 ($10/$50, 1M context, opt-in), Codex GPT-5.5 ($5/$30), Perplexity Sonar Pro ($3/$15), and the included-cost seats (agy, copilot, ollama, cursor-agent) at $0.
204. **Recommend one seat.** Pick the cheapest adequate option and defend it in two sentences. Mechanical work goes to included seats; hard reasoning justifies Opus 4.8 at `xhigh` effort; only 1M-context needs or judgment-class calls (ambiguous architecture, API design, product tradeoffs) justify Fable 5 or the claude-sdk seat.
215. **Check risk surfaces.** Regardless of the classification, escalate to a premium Claude seat when the task touches API or schema contracts, security-sensitive code or CI configuration, release artifacts, user-facing UI, a new module, or a breaking change. Cheap-seat agreement never settles a judgment-class decision.
226. **Show the spread.** A three-row table: recommended seat, one cheaper-but-riskier option, one premium option, each with estimated dollars for this task.
23
24## Guardrails
25
26- Never recommend Fable 5 or fast-mode Opus by default; both are 2x standard Opus cost and are opt-in only.
27- Never recommend Fable 5 for security audits; its safety classifiers can refuse offensive-security phrasing. Security review goes to Opus 4.8 (see `skills/blocks/fable5-prompting.md`).
28- If the estimate exceeds $1, say so explicitly before any dispatch happens.
29
30---
31
32**Source:** [`hashgraph-online/awesome-codex-plugins`](https://github.com/hashgraph-online/awesome-codex-plugins) → `plugins/nyldn/claude-octopus/skills/octopus-starter-pack/model-cost-compare/SKILL.md`
hashgraph-online