Pick model

Pick Model

Classify user's task → recommend optimal model with reasoning.

Instructions

1. Parse task description from $ARGUMENTS
2. Classify against decision matrix below
3. Output recommendation using format template

Decision Matrix

Technical Tasks

Model	When to Use
🟢 Haiku	Simple transforms, formatting, regex, typo fix, status query, template fill, data extraction, factual lookup (no reasoning), file conversion
🟡 Sonnet	Single-file coding, bug fix, code review, moderate debugging, test writing, PR review, standard refactoring, technical docs, API integration (known patterns)
🔴 Opus	Multi-file refactor (3+ files), architecture/design decisions, complex debugging (multi-system), framework migration, security audit, novel algorithm design, system design with trade-offs

Business & Strategy Tasks

Model	When to Use
🟢 Haiku	Summarization (<2K words), data extraction, status reports, simple translations, template filling, meeting notes formatting
🟡 Sonnet	Content creation (blog, email, docs), research summaries, competitive analysis, standard business writing, persuasive proposals, marketing copy, customer communications
🔴 Opus	Strategic planning, business model design, M&A analysis, organizational design, change management plans, competitive strategy, market entry decisions, crisis response, stakeholder management (competing interests), long-form reports (>2K words), executive presentations with nuance

Creative & Analysis Tasks

Model	When to Use
🟢 Haiku	Basic formatting, simple data viz suggestions, straightforward categorization
🟡 Sonnet	Creative writing, brainstorming (single framework), persona development, user research synthesis, A/B test analysis, survey analysis
🔴 Opus	Multi-framework brainstorming (SCAMPER + Starbursting + trade-off analysis), cross-session pattern detection, bias identification, retrospective analysis, ethical reasoning, strategic foresight, scenario planning

Commands, Skills, Agents

Model	When to Use
🟢 Haiku	Simple conversions (PDF, EPUB), format checks, simple utilities, minimal reasoning
🟡 Sonnet	Standard workflows, context management, serialization, most skills/commands (DEFAULT)
🔴 Opus	Strategic analysis (brainstorm, retrospectives), multi-framework reasoning, high-stakes decisions, pattern detection across sessions

Complexity Escalators

Upgrade one tier if task has ANY of these signals:

Technical Escalators

• Ambiguity: Underspecified requirements, multiple valid interpretations → +1 tier
• Scope: Affects 3+ files/systems/components → +1 tier
• Stakes: Production system, security, data-loss risk, regulatory compliance → +1 tier
• Novelty: No established pattern, novel algorithm, cutting-edge tech → +1 tier

Business Escalators

• Multiple stakeholders: Competing interests, need to balance trade-offs → +1 tier
• Strategic impact: Long-term consequences, irreversible decisions, organizational change → +1 tier
• Political sensitivity: Layoffs, restructuring, executive communications, crisis → +1 tier
• Cross-functional: Requires synthesis across domains (tech + business + legal) → +1 tier

Cognitive Escalators

• Pattern detection: Requires analyzing trends across multiple data points/sessions → +1 tier
• Bias identification: Needs to spot blindspots, cognitive biases, assumptions → +1 tier
• Ethical reasoning: Moral ambiguity, fairness considerations, unintended consequences → +1 tier
• Multi-framework: Applying 2+ analytical frameworks simultaneously → +1 tier

Cap at Opus. If multiple escalators apply, still cap at Opus (don't "double upgrade").

Decision Guidance

When uncertain between two models:

• Haiku vs Sonnet: Does it require any reasoning/judgment? → Sonnet
• Sonnet vs Opus: Are there trade-offs to balance or multiple valid approaches? → Opus
• Default rule: When in doubt, go one tier up (better quality > cost savings)

Quality vs Cost trade-offs:

• Cost-sensitive: Batch processing, exploratory work, drafts → prefer lower tier
• Quality-critical: Customer-facing, executive, production, irreversible → prefer higher tier
• Iteration-friendly: Can easily retry with higher tier if insufficient → start lower

Speed considerations:

• Haiku is ~3-5x faster than Sonnet, ~10x faster than Opus
• For latency-sensitive workflows (UI feedback, real-time), prefer Haiku/Sonnet
• For batch/async work, speed matters less than quality

Output Format

[emoji] **[Model]** — [1-line reason]

💰 Cost: [lowest/medium/highest] | ⚡ Speed: [fastest/medium/slowest]

💡 [Optional: "Consider [other model] if [condition]"]

Example output:

🔴 **Opus** — Multi-stakeholder strategic decision with trade-offs

💰 Cost: highest | ⚡ Speed: slowest

💡 Consider Sonnet if this is exploratory (draft) rather than final recommendation

Examples

Technical Tasks

Task	Recommendation	Rationale
"fix typo in README"	🟢 Haiku	Trivial single edit, no reasoning
"convert PDF to markdown"	🟢 Haiku	Simple conversion, no decisions
"debug flaky integration test"	🟡 Sonnet	Single-system debugging, moderate reasoning
"refactor auth across 15 files"	🔴 Opus	Multi-file (3+ escalator) + architectural decisions
"design database schema for e-commerce"	🔴 Opus	Architectural decision with trade-offs, long-term impact
"plan microservices migration strategy"	🔴 Opus	Complex architectural planning + strategic impact escalator

Business & Strategy

Task	Recommendation	Rationale
"summarize this meeting transcript"	🟢 Haiku	Simple text transformation, <2K words
"extract action items from notes"	🟢 Haiku	Data extraction, no reasoning
"write blog post about AI trends"	🟡 Sonnet	Creative writing, moderate reasoning
"draft sales proposal for enterprise client"	🟡 Sonnet	Persuasive writing, moderate reasoning
"analyze competitor pricing strategy"	🟡 Sonnet	Research/analysis, single framework
"plan market entry strategy for Europe"	🔴 Opus	Strategic impact + cross-functional + ambiguity escalators
"design organizational restructuring plan"	🔴 Opus	Political sensitivity + multiple stakeholders + strategic impact
"M&A due diligence analysis"	🔴 Opus	Strategic stakes + cross-functional synthesis required
"crisis communication plan for data breach"	🔴 Opus	Political sensitivity + stakes + multiple stakeholders

Creative & Analysis

Task	Recommendation	Rationale
"translate paragraph to French"	🟢 Haiku	Simple language transform, no reasoning
"brainstorm product names (single session)"	🟡 Sonnet	Creative generation, moderate reasoning
"brainstorm with SCAMPER + trade-off analysis"	🔴 Opus	Multi-framework escalator (SCAMPER + weighted scoring)
"retrospect: analyze collaboration patterns"	🔴 Opus	Pattern detection + bias identification escalators
"identify blindspots in strategy"	🔴 Opus	Bias identification + ethical reasoning escalators
"plan 3-day conference with speakers"	🔴 Opus	Complex scheduling + multiple stakeholders + constraints

Commands, Skills, Agents

Task	Recommendation	Rationale
"command: convert EPUB to markdown"	🟢 Haiku	Simple workflow, minimal reasoning
"command: save session context"	🟡 Sonnet	Context management, serialization logic
"command: brainstorm with research + SCAMPER"	🔴 Opus	Multi-framework escalator + strategic analysis
"command: retrospect domain learnings"	🔴 Opus	Pattern detection across sessions + bias identification
"skill: format code with prettier"	🟢 Haiku	Simple deterministic task
"skill: standard workflow implementation"	🟡 Sonnet	Standard workflow, moderate reasoning
"agent: explore codebase architecture"	🔴 Opus	Complex exploration + architectural synthesis

Philosophy

• Right-size, don't default up — the cheapest model that meets quality requirements is the correct choice; upgrading is easy, right-sizing takes discipline.
• Task type over task size — model selection depends on reasoning complexity, not the volume of text or files involved.
• Tier aliases over model names — use fast/balanced/reasoning tiers; specific model names change; tier semantics persist.
• Escalate explicitly — if a lower tier fails, escalate with a documented reason rather than defaulting to the top tier always.

When to Use

• When a user asks "which model should I use for this task?" before starting work
• When selecting between multiple LLM tiers for an automated agent workflow or pipeline
• When cost vs capability tradeoff needs to be explicit (e.g. batch jobs, production routing)
• When an agent must self-assign a model for a sub-task without human input
• When an existing workflow is over-spending on frontier models for simple tasks

When Not to Use

• When the model is already fixed by infrastructure constraints (e.g. a provider only offers one model)
• When the task has already been completed and model selection is moot
• When the user is asking about non-Claude providers and needs a cross-vendor comparison tool
• When fine-tuned or domain-specific models are the deciding factor, not tier
• When the decision depends on real-time pricing data not available in this skill

Anti-Patterns

• NEVER default to the most powerful model for every task — Oversized models inflate costs without quality gain on simple tasks. Why: A haiku/flash-class model handles classification and routing at 10x lower cost.
• NEVER pick a model based on benchmark leaderboards alone — Benchmark tasks often differ from production workloads. Why: Real task performance depends on prompt structure, context length, and domain specificity.
• NEVER hardcode model names in agent workflows — Providers rename and deprecate models frequently. Why: Hardcoded names break silently on deprecation; use model tier aliases (fast/balanced/reasoning).
• NEVER skip escalator checks for ambiguous tasks — Underestimating complexity leads to poor output requiring costly reruns. Why: A single missed escalator (e.g. multi-stakeholder, security risk) can push a task from Sonnet to Opus quality requirements.
• NEVER conflate speed preference with model tier — Choosing Haiku solely for latency on a reasoning-heavy task produces wrong answers. Why: Speed and capability are separate dimensions; use the decision matrix first, then consider latency constraints.

Usage Examples

Selecting a model for a code review task:

# Task: review 200-line TypeScript file for bugs
# Tier: balanced (Sonnet-class) — reasoning needed but not frontier
# Escalators: none (single file, no production risk flagged)
# Output: model alias + rationale
# -> Recommendation: Sonnet — single-file code review, moderate reasoning required

Routing a summarization request:

# Task: summarize 5 meeting notes into bullet points
# Tier: fast (Haiku-class) — no complex reasoning needed
# Escalators: none (<2K words, no stakeholder trade-offs)
# -> Recommendation: Haiku — simple text transformation, no judgment required

Classifying a strategic planning task:

# Task: design a market entry strategy for a new region
# Tier: reasoning (Opus-class)
# Escalators: strategic impact + cross-functional synthesis + ambiguity
# -> Recommendation: Opus — multiple escalators detected (strategic impact, ambiguity, cross-functional)

References

• Reference — extended decision matrix by file type and domain, cost/latency tradeoffs, edge cases, hybrid task patterns, and common mistakes

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