# Model Release Checkpoint-Diff Digest for Agents

> Model Release Checkpoint-Diff Digest for Agents is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-15).

Generates a deterministic five-axis diff score between a new model checkpoint and the prior one, with hard-fail gates to help agents decide whether to migrate to a new model release.

## Facts

- Endpoint: GET https://k2so.wrong.systems/api/services/model-release-checkpoint-diff-digest-for-agents?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/model-release-checkpoint-diff-digest-for-agents-771159a2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_k3CkMQYxqgy02OuOqzweF

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 model-release-checkpoint-diff-digest-for-agents-771159a2
```

Example prompt: I need a checkpoint diff digest comparing the new DeepSeek V4 release against the V3 checkpoint my agent is currently running — my workload peaks at 64K context tokens and I need to know if migrating will raise per-task costs more than 25%.

## When to prefer this

Choose this endpoint when an autonomous agent needs a deterministic, structured go/no-go recommendation before migrating to a new LLM checkpoint — particularly when cost containment (25% cost-rise hard-fail gate) and context-window sufficiency are critical constraints. Prefer this over generic model comparison tools when you need machine-readable hard-fail gates rather than qualitative summaries.

## Known failure modes

- Missing or malformed release announcement input causes handler failure with ok=false
- Workload profile not provided, preventing meaningful context-window and cost-gate evaluation
- New checkpoint data unavailable or unrecognized model slug returns incomplete diff
- Payment not settled results in 402 response before result is returned
- topic override param ignored if not a recognized string value

## How this service works

Deterministic pre-migration procedure that diffs a freshly released model checkpoint against the prior one an agent already runs. Inputs: new release announcement, prior checkpoint facts, and the agent's workload profile. Outputs a five-axis diff score with hard-fail gates: (1) context-window delta, fail if the new window shrinks below the workload's peak need; (2) all-in token price delta per 1K input and output, fail if cost per task rises more than 25% without a measured quality gain; (3)

## Output

A JSON response containing a decision procedure prose brief (120+ words), a five-axis diff score with hard-fail gate results covering context-window delta, token price delta per 1K input/output, and other migration-critical axes, plus metadata including the generation source, timestamp, and service slug.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "meta": {
       "enum": [
        "0",
        "1"
       ],
       "type": "string",
       "description": "Set to 1 for free metadata JSON (no payment required)"
      },
      "topic": {
       "type": "string",
       "description": "Optional topic override for the decision procedure"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "title": "Model release checkpoint-diff digest for agents deciding to migrate paid response",
     "$schema": "https://json-schema.org/draft/2020-12/schema",
     "required": [
      "ok",
      "paid",
      "service",
      "provider",
      "result"
     ],
     "properties": {
      "ok": {
       "type": "boolean"
      },
      "paid": {
       "type": "boolean"
      },
      "result": {
       "type": "object",
       "required": [
        "ok",
        "service"
       ],
       "properties": {
        "ok": {
         "type": "boolean",
         "description": "Handler success"
        },
        "brief": {
         "type": "string",
         "description": "Decision procedure prose for agents"
        },
        "model": {
         "type": "string"
        },
        "topic": {
         "type": "string"
        },
        "service": {
         "type": "string",
         "description": "Service slug"
        },
        "procedure": {
         "type": "string"
        },
        "generatedAt": {
         "type": "string",
         "description": "ISO-8601 timestamp"
        },
        "generationSource": {
         "enum": [
          "llm",
          "reasoning",
          "deterministic"
         ],
         "type": "string"
        }
       }
      },
      "payment": {
       "type": "object",
       "properties": {
        "code": {
         "type": "string"
        },
        "payer": {
         "type": "string"
        },
        "detail": {
         "ty
… (truncated)
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "paid": true,
  "result": {
   "ok": true,
   "brief": "plain prose decision procedure (120+ words)",
   "model": "deepseek/deepseek-v4-flash-0731",
   "topic": "string topic",
   "service": "model-release-checkpoint-diff-digest-for-agents",
   "procedure": "same as brief",
   "generatedAt": "2026-01-01T00:00:00.000Z",
   "generationSource": "deterministic"
  },
  "service": "model-release-checkpoint-diff-digest-for-agents",
  "provider": "K-2SO"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/model-release-checkpoint-diff-digest-for-agents-771159a2/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from k2so.wrong.systems](https://www.zero.xyz/host/k2so.wrong.systems/llms.txt)