claude-fable-5-2

anthropicmodel ID claude-fable-5-2-35%35% OFF

claude-fable-5-2 costs $5.20 per million input tokens and $26 per million output tokens through the KoRouter API — 35% below Anthropic's official rate, pay as you go with credits.

Context window1M input tokens
Input modalitiestext, image, file
Output modalitiestext

Call it in one request

curl · claude-fable-5-2

curl https://korouter.ai/v1/messages \
  -H "x-api-key: sk-your-key" \
  -H "anthropic-version: 2023-06-01" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-fable-5-2",
    "max_tokens": 1024,
    "messages": [{ "role": "user", "content": "Hello" }]
  }'

claude-fable-5-2 is served on the Anthropic Messages API, so Claude Code reaches it by pointing ANTHROPIC_BASE_URL at KoRouter — no wrapper, no proxy config. The same model ID also answers on the OpenAI-compatible endpoint above, which is what Codex, Cline, Continue and Aider use. Setup guides per tool.

Replace sk-your-key with a key from the console. Model IDs are bare names — see the docs.

What a real coding session costs

Per-token price tables mislead for agentic coding. A focused two-hour Claude Code session re-sends its context on every request, so 88% of its tokens are cache reads rather than fresh input — and the cache rate, not the headline input price, decides most of the bill. Priced at claude-fable-5-2's live rates, that session costs $6.83 through KoRouter, against $10.50 at Anthropic's official prices.

Cache reads · 5M tokens$0.65
Fresh input · 250K tokens$1.30
Output · 100K tokens$2.60
Cache writes · 350K tokens$2.27
Session total$6.83

The token mix is a stated assumption, not a measurement — change it and re-price every model in the cost calculator, or read the full worked example in what a real Claude Code session costs. Prices come from the live billing catalog.

The same session elsewhere

The same reference session, priced at each model's live KoRouter rates — the nearest options on either side of claude-fable-5-2.

Supported parameters

max_tokensmax_completion_tokensreasoningreasoning_effortinclude_reasoningtoolstool_choiceresponse_formatstructured_outputsweb_search_options

More models

claude-opus-5-5 claude-fable-5.1 claude-sonnet-5-5 claude-fable-5 claude-haiku-4-5 claude-opus-4-6 claude-opus-4-7 claude-opus-4-8

Prices use the live billing catalog · live availability · all models