# Claude 1.2

[Canonical model page](https://headlessthrones.com/models/claude-1-2) · [Model library](https://headlessthrones.com/models)

Public catalog reference from Headless Thrones. Exact catalog ID: `claude-1-2`. Catalog source-check date: 2026-10-23.

This brief contains the public catalog answers and any catalog guide, not private drafts, historical editorial revisions or independently measured rankings. The canonical HTML page may also display separately published editorial.

Current catalog answers

## What to know about Claude 1.2

AI-compiled from linked model documentation. This is a catalog reference, not an independent performance review. Catalog checked October 23, 2026.

[Retirement & migration](https://headlessthrones.com/models/claude-1-2#model-answer-research) · [Exact model](https://headlessthrones.com/models/claude-1-2#model-answer-identity) · [Access](https://headlessthrones.com/models/claude-1-2#model-answer-access)

### What happened to Claude 1.2, and what replaces it?

These details come from the linked publisher material for this model. Reported capabilities and training descriptions are publisher statements, not independent test results.

**API retirement**: Anthropic records retirement on 2024-11-06 for its operated platforms. Partner-operated Bedrock and Google deployments can use different schedules. [Source](https://platform.claude.com/docs/en/about-claude/model-deprecations)

**Recommended migration**: The current lifecycle table names claude-haiku-4-5-20251001 as the replacement. Requests to the retired model fail; test the replacement before migrating. [Source](https://platform.claude.com/docs/en/about-claude/model-deprecations)

### Which Claude 1.2 does this page describe?

Claude 1.2 is a model record from **Anthropic** in the Claude family. [Source](https://platform.claude.com/docs/en/about-claude/model-deprecations)

The recorded model identifier or checkpoint is `claude-1.2`. Use that exact identifier when checking documentation or a provider listing. [Source](https://platform.claude.com/docs/en/about-claude/model-deprecations)

### How can you access Claude 1.2?

The catalog records the historical **API** access route for Claude 1.2. [Source](https://platform.claude.com/docs/en/about-claude/model-deprecations)

As of the catalog check, this version was marked retired. [Source](https://platform.claude.com/docs/en/about-claude/model-deprecations) Check the linked lifecycle information before starting a new integration.

For a new integration, use the publisher’s replacement guidance and check its current account, region and endpoint requirements. Historical API access does not mean the retired endpoint can still be called.

**Catalog qualifications:** Historical API identity from Anthropic lifecycle documentation; availability applies to Anthropic-operated API. Historical specs unverified.

**Evidence still missing here:** complete input/output pricing, context or input capacity, and knowledge and training-data cutoffs. Missing documentation is not evidence that a feature is unavailable.

Headless Thrones has not independently benchmarked this model for this reference. Evaluate it on representative work before choosing it; these facts do not rank its accuracy, reliability, speed or suitability against another model.

Keep the exact version in view

## Other Claude models from Anthropic.

These are separate records in the same publisher family. A shared family name does not establish equal capabilities or interchangeable licenses.

### [Claude 1.0](https://headlessthrones.com/models/claude-1-0)

API

### [Claude 1.1](https://headlessthrones.com/models/claude-1-1)

API

### [Claude 1.3](https://headlessthrones.com/models/claude-1-3)

API

### [Claude 2.0](https://headlessthrones.com/models/claude-2-0)

API

### [Claude 2.1](https://headlessthrones.com/models/claude-2-1)

API

### [Claude 3 5 Haiku 20241022](https://headlessthrones.com/models/claude-3-5-haiku-20241022)

API