Haiku 5.5 ZenMux guide

A Haiku 5.5 ZenMux connection uses ZenMux as the gateway between an application and the model provider. The gateway account supplies the credential and receives the API charge. This guide covers setting up your own gateway account. Purchasing credits on Haiku5-5.com does not provide gateway credentials or API access.

Keep three quantities separate from the start: manufacturer API prices, the gateway's actual charges and this website's credit rules. They answer different questions. A public cost calculator can use official manufacturer rates without claiming that a site credit is a dollar or that every gateway route has identical accounting.

Match the Haiku 5.5 ZenMux account and endpoint

ZenMux's quickstart documents its connection options. For the OpenAI-compatible chat interface, use the documented ZenMux endpoint and a ZenMux bearer credential. An Anthropic key, an OpenRouter key and a site login are not substitutes for that credential.

Keep the key on the server and configure it through your deployment's secret mechanism. In local development, use an ignored environment file loaded by the application. Never make the key public merely to let a browser call the gateway directly; users should authenticate to your application instead.

Check the credential type against the operations you need. Sending a model request and retrieving platform accounting records can have different requirements. Verify those requirements in the current service documentation before promising that one successful request proves every recovery and billing operation is available.

Use the gateway model identifier

The Haiku 5.5 ZenMux catalog uses a provider-prefixed identifier. Keep it as configured by the gateway rather than converting it to the native Anthropic spelling. A model's display name is useful for a selector, but the literal request identifier is part of the integration contract.

The following Bash example targets the documented chat-completions endpoint. It is an illustrative synthetic request, not a paid execution result from this article. Running it requires your own account and can incur charges.

curl --fail-with-body https://zenmux.ai/api/v1/chat/completions \
  -H "Authorization: Bearer $ZENMUX_API_KEY" \
  -H "Content-Type: application/json" \
  --data '{
    "model": "anthropic/claude-haiku-5.5",
    "max_completion_tokens": 2048,
    "messages": [{
      "role": "user",
      "content": "Summarize this synthetic note in one sentence: The draft is ready, but release approval is still pending."
    }]
  }'

The answer should preserve the pending approval rather than claiming the release is complete. That is the acceptance criterion for the example. Inspect the actual returned completion state and usage before treating any received sentence as a completed, billable application result.

Verify Haiku 5.5 ZenMux parameters individually

The gateway API reference lists fields that may be supported across different models. That does not mean every listed field is accepted by this model or by every serving route. Verify the model-specific configuration for output limits, reasoning and any advanced feature your application relies on.

Begin with a short text request, then add streaming, structured output or tools as separate integration steps. Keep fixtures for each response shape. A request that works without tools does not establish that the tool round trip is correctly adapted, authorized or recoverable.

Do not publish an effort selector containing values that have not been verified for the route. A UI can display a plausible option while the adapter silently drops it. Record which settings were accepted upstream and expose only the choices the application can represent accurately.

Choose provider routing deliberately

ZenMux documents provider routing separately from model selection. A Haiku 5.5 ZenMux application should decide whether it permits route changes or needs a verified provider pin. That decision affects reproducibility and the evidence required to explain an unexpected result.

Do not invent a provider suffix from a company name. Confirm the exact supported route identifier in the current catalog or account evidence. If a required route is unavailable, report that state rather than silently switching to another model or provider while keeping the original label in the interface.

For comparisons, retain the actual serving model and route information available from the response. Two outputs labeled with the same friendly model name may still have different operational conditions. A comparison report should preserve those conditions when they affect interpretation.

Separate Haiku 5.5 ZenMux recovery from accounting

The generation-record interface provides platform information about a generation. Its existence does not establish that the complete answer text can be recovered after a broken stream. Inspect the documented fields before building a recovery feature around assumptions.

For Haiku 5.5 ZenMux streaming, persist the generation identifier and received result through a durable application lifecycle. If the stream ends ambiguously, keep the task unresolved until authoritative evidence supports a final state. Do not invent an answer from usage data or resubmit automatically merely because the browser lost its connection.

Accounting and content completion can arrive at different times. A task can have a stored answer while billing evidence is still pending, or have accounting evidence without a recoverable full answer. Represent those states separately so neither a zero balance nor a success badge is inferred from incomplete information.

Normalize usage before charging site credits

Read the gateway's current definitions of input, output and reasoning-related fields. Determine which categories overlap before adding them. A reasoning count that is already included in output must not be charged a second time as if it were additional output.

A Haiku 5.5 ZenMux integration should preserve the raw metering evidence and the normalization version used by the application. When a provider changes its response schema, that record helps distinguish a genuine usage change from an adapter interpretation change. Missing measurements should remain unknown rather than becoming zero by default.

Settle an application operation once through an idempotent server-side transition. A stream handler, page refresh and recovery worker can all observe the same generation, but they must not independently deduct credits. Browser display logic should read the settled state rather than own the accounting decision.

Keep customer-facing prices understandable

Use the official model pricing page for manufacturer comparisons and the site's credit-pack page for the product the customer buys. Explain credit consumption through the site's published rules without exposing a confusing mixture of upstream rates, internal margins and unrelated subscription allowances.

For Haiku 5.5 ZenMux operators, monitor actual gateway cost separately from customer credit balances. That operational view is needed to understand whether the product's pricing covers its workload. It does not require presenting every internal provider metric as a purchase decision the customer must interpret.

Do not promise that adding an API key alone enables paid generation. A production route also needs verified model access, supported request settings and trustworthy metering. Configuration presence is one prerequisite; end-to-end account-level verification is another.

Verify without spending by accident

Run parser, lifecycle and settlement tests against clearly labeled synthetic responses. Include incomplete streams, unknown usage, mismatched model identifiers and repeated completion signals. These fixtures should fail safely without falling back to a real credential when a mock is missing.

For a deployed configuration failure, check environment scope and redeployment status before changing application logic. A secret saved for local development is not automatically present in preview or production. Log the presence of required configuration and a nonsecret route identifier, never the credential value, so the diagnosis remains useful without exposing access.

Reserve live Haiku 5.5 ZenMux tests for an explicitly authorized account and spending scope. Keep the results dated and distinguish them from documentation checks. The streaming guide covers partial-output states, and the rate-limits guide covers shared capacity planning around the connection.