Model Catalog

Query model specs, estimate costs, and find the right model.

Model Shortcuts

Alias	Full Model
gpt5	openai:gpt-5.2 (latest flagship)
gpt5.2	openai:gpt-5.2
gpt5.1	openai:gpt-5.1
gpt5-mini	openai:gpt-5-mini
gpt5-nano	openai:gpt-5-nano
o1	openai:o1
o3	openai:o3
sonnet	anthropic:claude-sonnet-4-5
haiku	anthropic:claude-haiku-4-5
opus	anthropic:claude-opus-4-5
flash	gemini:gemini-2.5-flash
flash-lite	gemini:gemini-2.5-flash-lite
pro	gemini:gemini-3-pro-preview

Model Registry API

const client = new LLMist();
const registry = client.modelRegistry;

// Get model spec
const spec = registry.getModelSpec('gpt-5');
console.log(spec.displayName);      // "GPT-5"
console.log(spec.contextWindow);    // 272000
console.log(spec.pricing.input);    // 1.25 (per 1M tokens)

// List models
const all = registry.listModels();
const openai = registry.listModels('openai');

Cost Estimation

const cost = registry.estimateCost('gpt-5', 10_000, 2_000);

console.log(cost.inputCost);   // $0.0125
console.log(cost.outputCost);  // $0.020
console.log(cost.totalCost);   // $0.0325

Token Counting

const messages = [
  { role: 'system', content: 'You are helpful' },
  { role: 'user', content: 'Hello!' },
];

const tokens = await client.countTokens('openai:gpt-5', messages);
const cost = registry.estimateCost('gpt-5', tokens, 1000);

Feature Queries

const hasVision = registry.supportsFeature('gpt-5', 'vision');
const visionModels = registry.getModelsByFeature('vision');

Available features: streaming, functionCalling, vision, reasoning, structuredOutputs, fineTuning

Find Cheapest Model

const cheapest = registry.getCheapestModel(10_000, 2_000);
console.log(cheapest.modelId);

See Also

• Custom Models - Register your own models
• Providers Guide - Provider configuration