---
format: "aidr-story-markdown/v1"
id: "5c44ede6005688b05f7470c7b5a98918ccae81410b914fea9c714e73c20d18f3"
canonical_url: "https://aidr.today/5c44ede6?lang=en"
title: "Anthropic Targets Tuesday Launch for Opus 5.5 to Fight GPT 6 Astra"
lang: "en"
requested_lang: "en"
available_langs: ["en","vi"]
translation_fallback: null
fallback_fields: []
published_at: "2026-09-20T20:38:31.000Z"
category: "Models"
topics: ["anthropic","claude","multi-agent","open-source","opus-55","gpt-6-astra","inference"]
source_urls: ["https://huggingnews.com/ai/anthropic-targets-tuesday-launch-for-opus-55-to-fight-gpt-6-astra-fea5e4b8","https://x.com/lyraxana/status/2101668658711798083","https://x.com/lyraxana/status/2101696802797838824","https://x.com/rohanpaul_ai/status/2101654544937857056","https://x.com/Hangsiin/status/2101733639579120080","https://x.com/kimmonismus/status/2101701166321086696","https://marketbrief.now/ai/anthropic-targets-tuesday-launch-for-opus-55-to-fight-gpt-6-astra-fea5e4b8"]
summary: "The new Opus 5.5 AI model enters stealth testing under the codename `claude-wafer-eap` with a target launch on Tuesday. Input costs are $4 per Mtok and output costs are $20 per Mtok, with cache reads at $0.2 and writes at $5 per Mtok. The update eliminates forced tool use and restricts the model to an adaptive thinking mode with no \"off\" option. Reuters reports the launch follows the Sept 3 release of GPT-6 Astra, which pressured Anthropic's standing in the enterprise market. The company provided partners with a 24 hour access window to the checkpoint, though the official rollout could arrive as early as Monday of the upcoming week."
---

# Anthropic Targets Tuesday Launch for Opus 5\.5 to Fight GPT 6 Astra

> [Open the canonical story](<https://aidr.today/5c44ede6?lang=en>)

**Published:** 2026-09-20T20:38:31.000Z
**Category:** Models
**Topics:** anthropic, claude, multi\-agent, open\-source, opus\-55, gpt\-6\-astra, inference

## Summary

The new Opus 5\.5 AI model enters stealth testing under the codename \`claude\-wafer\-eap\` with a target launch on Tuesday\. Input costs are $4 per Mtok and output costs are $20 per Mtok, with cache reads at $0\.2 and writes at $5 per Mtok\. The update eliminates forced tool use and restricts the model to an adaptive thinking mode with no "off" option\. Reuters reports the launch follows the Sept 3 release of GPT\-6 Astra, which pressured Anthropic's standing in the enterprise market\. The company provided partners with a 24 hour access window to the checkpoint, though the official rollout could arrive as early as Monday of the upcoming week\.

## Sources

- [Story source](<https://huggingnews.com/ai/anthropic-targets-tuesday-launch-for-opus-55-to-fight-gpt-6-astra-fea5e4b8>)
- [Story source](<https://x.com/lyraxana/status/2101668658711798083>)
- [Supporting source](<https://x.com/lyraxana/status/2101696802797838824>)
- [Supporting source](<https://x.com/rohanpaul_ai/status/2101654544937857056>)
- [Supporting source](<https://x.com/Hangsiin/status/2101733639579120080>)
- [Supporting source](<https://x.com/kimmonismus/status/2101701166321086696>)
- [Story source](<https://marketbrief.now/ai/anthropic-targets-tuesday-launch-for-opus-55-to-fight-gpt-6-astra-fea5e4b8>)