---
title: "Releasing Claude Instant 1.2"
description: "Claude Instant 1.2 is available to businesses through an API as a faster, lower-priced model for casual dialogue, text analysis, summarization, and document comprehension. It incorporates strengths of Claude 2 in real-world use cases, producing longer, more structured responses, following formatting instructions better, and improving math, coding, reasoning, safety, quote extraction, multilingual capabilities, and question answering. Against Claude Instant 1.1, it scored 58.7% versus 52.8% on the Codex evaluation and 86.7% versus 80.9% on GSM8K, indicating gains on the reported math and coding measures. The release also reports less hallucination and greater resistance to jailbreaks in automated red-teaming, while developers can call the model through the API; pricing for developers is available separately."
---

# Releasing Claude Instant 1.2

[Anthropic](https://yomu.fyi/company/anthropic) · Sep 9, 2026

**Type:** Announcement

## Summary

Claude Instant 1.2 is available to businesses through an API as a faster, lower-priced model for casual dialogue, text analysis, summarization, and document comprehension. It incorporates strengths of Claude 2 in real-world use cases, producing longer, more structured responses, following formatting instructions better, and improving math, coding, reasoning, safety, quote extraction, multilingual capabilities, and question answering. Against Claude Instant 1.1, it scored 58.7% versus 52.8% on the Codex evaluation and 86.7% versus 80.9% on GSM8K, indicating gains on the reported math and coding measures. The release also reports less hallucination and greater resistance to jailbreaks in automated red-teaming, while developers can call the model through the API; pricing for developers is available separately.

## Context

Claude Instant is positioned as a faster, lower-priced model for businesses that need capabilities including casual dialogue, text analysis, summarization, and document comprehension. Version 1.2 is compared with Claude Instant 1.1 and incorporates strengths from Claude 2 in real-world use cases.

## Approach / What changed

Version 1.2 applies improvements in math, coding, reasoning, safety, response structure, formatting adherence, quote extraction, multilingual capabilities, and question answering. It is made available through an API and evaluated against version 1.1 using the Codex and GSM8K benchmarks plus automated red-teaming.

## Takeaways

- Claude Instant 1.2 scored 58.7% on the Codex evaluation versus 52.8% for Claude Instant 1.1, and 86.7% on GSM8K versus 80.9%.
- The model generates longer, more structured responses, follows formatting instructions better, and improves quote extraction, multilingual capabilities, and question answering.
- Automated red-teaming reports that Claude Instant 1.2 hallucinates less and is more resistant to jailbreaks than the earlier model.

**Tags:** [AI](https://yomu.fyi/topic/ai), [Claude](https://yomu.fyi/topic/claude), [Model Evaluation](https://yomu.fyi/topic/model-evaluation)

- Source: [Anthropic](https://www.anthropic.com/news/releasing-claude-instant-1-2)
- Source URL: https://www.anthropic.com/news/releasing-claude-instant-1-2
- Ingested by Yomu: 2026-09-10T04:05:08.209Z

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