# Why does generated Claude API code use models that do not exist?

Canonical URL: https://bestskillsforclaude.com/en/skills/claude-api
Language: en
Skill: claude-api
Publisher: Anthropic (https://github.com/anthropics)
Source: https://github.com/anthropics/skills/tree/main/skills/claude-api
License as stated by the publisher: Apache 2.0
Runtime: Claude apps and Claude Code
Category: Extend Claude
Last reviewed: 2026-08-05

Because model names change faster than any training snapshot.

## Short answer
The claude-api skill provides reference detail for the Claude API, including model identifiers, parameters, streaming, tool use and caching, so integration code is written against the current shape of the API rather than a remembered one. Load it before writing any Claude integration, and check pricing at the source before quoting it.

Best for: Anyone writing code against the Claude API, or estimating cost for a feature.
Skip it if: You are integrating a different provider, where this guidance is simply wrong.

## What to remember
- Model identifiers are the most common concrete error in generated integration code.
- It covers the patterns around the call, including streaming, tool use and caching.
- Pricing changes. Treat any number in a skill as needing verification at the source.
- It is provider specific by design and does not apply to other APIs.

## What it changes in practice
Integration code fails first on identifiers and parameter shapes. Those are exactly the details that shift between releases, so they are also the details a model is most likely to get subtly wrong from memory.
The wider benefit is the patterns around the call. Prompt caching, streaming and tool use loops are easy to implement badly and expensive to leave that way.

## Where it disappoints
Any reference material can lag the API. Where money or limits are involved, confirm against the official documentation rather than the skill.
It also has nothing to say about the parts that actually determine quality, such as how you structure prompts and evaluate output.

## Install and first run
1. Install it from anthropics/skills under Apache 2.0.
2. Load it before writing integration code, not after debugging a wrong model identifier.
3. Verify pricing and limits against the official documentation before committing them to a budget.

## Questions
### What does it help with most?
Getting model identifiers, parameters and call patterns right the first time.

### Can I trust the pricing figures?
Verify them at the source. Pricing is the field most likely to be out of date in any cached reference.

### Does it help with other providers?
No. It is specific to the Claude API and should not be applied elsewhere.

## Sources
- anthropics/skills on GitHub: https://github.com/anthropics/skills
- anthropics/skills, claude-api skill directory: https://github.com/anthropics/skills/tree/main/skills/claude-api

## Other languages
- Spanish: https://bestskillsforclaude.com/es/skills/claude-api
- Brazilian Portuguese: https://bestskillsforclaude.com/pt-br/skills/claude-api
- Japanese: https://bestskillsforclaude.com/ja/skills/claude-api