---
schema_version: "newruntime-agent-readable-v0.1"
type: "raw_signal"
id: "tg-2696"
slug: "fable-cost-per-completed-task"
title: "A pricier model can be cheaper per completed task"
description: "Cognition reports that Fable 5 completed coding work with fewer steps and output tokens than its previous lead model."
observed_at: "2026-07-15"
why_it_matters: "Agent economics must include turns, tool calls, retries, delegated work, and human review rather than reducing cost to the token price printed on a model card."
novelty: "structural"
verification_level: "source-inspected"
signal_type: "field-report"
evidence_kind: "mixed"
status: "published"
telegram_message_id: 2696
telegram_url: "https://t.me/qwgai/2696"
topics: ["agent-economics","coding-agents","model-routing"]
entities: ["Cognition","Fable 5","Devin Fusion"]
related_patterns: []
source_urls: ["https://cognition.com/blog/making-fable-cheaper-than-opus"]
import_batch: "telegram-2026-07-17-v1"
routes: {"html":"https://newruntime.com/signals/fable-cost-per-completed-task/","markdown":"https://newruntime.com/signals/fable-cost-per-completed-task.md","json":"https://newruntime.com/signals/fable-cost-per-completed-task.json"}
source_format: "telegram-export-normalized-json"
---

# A pricier model can be cheaper per completed task

## Observation

Cognition reports that Fable 5 completed coding work with fewer steps and output tokens than its previous lead model.

## Why it matters

Agent economics must include turns, tool calls, retries, delegated work, and human review rather than reducing cost to the token price printed on a model card.

## Provenance

Normalized from QWG AI Telegram message 2696. The original Russian-language record remains available at https://t.me/qwgai/2696.