Models

Every Claudech model is reached through the same endpoint; switching models is a one-word change. This page lists the current catalogue. Prices and limits below are read live from the published catalogue and match what GET /v1/models returns.

Catalogue#

Prices are per one million tokens in USD and are converted to Claudech tokens at the account rate; see Tokens & billing. Cached input is the discounted rate for prompt tokens served from the prompt cache.

Choosing a model#

• claude-opus-5-5: the default. Strong reasoning with quick responses. Start here for chat, coding assistants, analysis and agents.
• claude-fable-5-1: our most capable model for complex, multi-step work where quality matters most: long documents, architecture decisions, difficult synthesis.
• claude-opus-5: extended thinking for hard problems in mathematics, research and intricate debugging. Slower and produces more reasoning tokens; best when correctness beats latency.
• claude-opus-5-5: lowest latency for high-volume tasks: classification, extraction, summarisation, routing and simple chat. Thinking is off, so answers start immediately.

Every model is available on every plan and is billed at the per-token rates in the catalogue above.

Capabilities#

• Reasoning models think before answering. Their thinking is returned in reasoning_content when present and counted in completion_tokens_details.reasoning_tokens. Control effort with reasoning_effort; see Tool calling & JSON.
• Tool calling lets the model request calls to functions you define.
• JSON mode (response_format: {"type": "json_object"}) guarantees syntactically valid JSON output.
• Vision models accept image_url content parts (data URLs or public URLs).

Context windows and output limits#

The context window is the total of prompt and completion tokens a model can handle in one request. Every Claudech model accepts 1 million tokens of context on every plan. Requests above that limit fail before billing with context_length_exceeded.

Max output is the ceiling for max_tokens. If you omit max_tokens, Claudech applies a sensible per-model default (8K for claude-opus-5-5, 16K for claude-fable-5-1 and claude-opus-5, 4K for claude-opus-5-5) and never exceeds what fits in the remaining context.

Fallbacks#

For resilience, some models define a fallback of equal or greater capability. If the primary route is unavailable, rate-limited upstream, or times out before producing output, Claudech transparently retries on the fallback. When this happens:

• model in the response still shows the model you asked for;
• streaming responses include "fallback_used": true in the final claud billing event;
• you are billed at the price of the model you requested, never more.

Deprecations#

When a model is scheduled for retirement it is marked deprecated: true in GET /v1/models and on this page, and continues to work until the announced date. We announce deprecations by email to all account owners at least 30 days in advance.

Listing models programmatically#

curl https://api.claudech.com/v1/models \
  -H "Authorization: Bearer $CLAUDECH_API_KEY"

See the Models reference for the full response shape.