{"version":"2.1.261","anchor":"bedrock-count-tokens-fallback-no-longer-uses-haiku-probe","canonical_anchor":"bedrock-count-tokens-fallback-no-longer-uses-haiku-probe","heading":"Bedrock count_tokens fallback no longer uses Haiku probe","tier":"notice","area":"Elsewhere","scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.261\/e\/bedrock-count-tokens-fallback-no-longer-uses-haiku-probe","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.261","markdown":"### Bedrock count_tokens fallback no longer uses Haiku probe\n\nBedrock token counting fallback now uses your own model instead of a Haiku probe.\n\nWhen a Bedrock-style proxy returns 501 for `count_tokens`, the client no longer falls back to a Haiku `max_tokens:1` probe. It instead counts tokens with a one-token request using the session's own model, unless `ANTHROPIC_SMALL_FAST_MODEL` or `ANTHROPIC_DEFAULT_HAIKU_MODEL` is set.\n\n- Area: Elsewhere\n- Names: `ANTHROPIC_SMALL_FAST_MODEL`, `ANTHROPIC_DEFAULT_HAIKU_MODEL`\n- Tier: You'll notice\n- Useful: 2\/5\n- Signal: 1\/5"}