# AI Model Comparison Tool

> AI Model Comparison Tool is a paid API for AI agents from api.agentstools.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Compares two to five AI language models side by side on price, context window, capabilities, knowledge cutoff, and coding benchmark, returning normalized scores and best-in-class flags.

## Facts

- Endpoint: GET https://api.agentstools.dev/model/compare
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ai-model-comparison-tool-32fe68ba
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_cJXSZBiU3OtYMDZpFC_bG

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability ai-model-comparison-tool-32fe68ba
```

Example prompt: Compare GPT-4o, Claude 3.5 Sonnet, and Gemini 1.5 Pro side by side — I want to see how they stack up on price, context window, coding benchmarks, and knowledge cutoff, and flag which one is the cheapest and which has the best benchmark score.

## When to prefer this

Use this endpoint when an agent or user needs a structured, normalized side-by-side comparison of specific AI models rather than a general web search or documentation lookup. It is ideal when choosing between 2–5 candidate models for a project and needing objective, cited data on cost, context, and coding performance in a single call. Prefer it over manually scraping provider pricing pages or reading benchmark leaderboards separately.

## Known failure modes

- Fewer than two or more than five models specified — returns validation error
- Unrecognized model name or alias not found in catalogs — model entry may be missing or flagged as unknown
- Comma-separated list malformed — returns parse error
- Payment not provided or insufficient — returns 402 Payment Required
- Upstream catalog unavailable — may return partial results or 503

## How this service works

Compare two to five models side by side. Give a comma separated list of names or aliases and get each model normalized on price, context, capabilities, knowledge cutoff and coding benchmark, plus flags for the cheapest, the best benchmark and the largest context. Fused from open keyless catalogs with a citation on every model.

## Output

A JSON object with each requested model normalized across price, context window size, capabilities, knowledge cutoff date, and coding benchmark score, plus boolean flags identifying the cheapest model, the one with the best benchmark, and the one with the largest context window. Each model entry includes a citation pointing to the open catalog source used.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "models"
     ],
     "properties": {
      "models": {
       "type": "string",
       "description": "Comma separated list of two to five model names or aliases to compare."
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ai-model-comparison-tool-32fe68ba/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.agentstools.dev](https://www.zero.xyz/host/api.agentstools.dev/llms.txt)