---
type: "raw_signal"
id: "claude-opus-5-5-gpt-6-sol-gpt-bd5a89"
slug: "claude-opus-5-5-gpt-6-sol-gpt-bd5a89"
title: "Claude Opus 5.5, GPT-6 Sol, GPT-6 Luna, and a new price war"
description: "Simon Willison reports that Anthropic released Claude Opus 5.5 and OpenAI released GPT-6 Sol and GPT-6 Luna within roughly an hour of each other."
retrieval_nugget: "Simon Willison reports that Anthropic released Claude Opus 5.5 and OpenAI released GPT-6 Sol and GPT-6 Luna within roughly an hour of each other."
observed_at: "2026-09-23"
record_date: "2026-09-23"
date_kind: "observed_at"
why_it_matters: "Source: https://simonwillison.net/2026/Sep/22/opus-and-sol-and-luna"
novelty: "notable"
verification_level: "source-linked"
signal_type: "announcement"
source_platform: "simonwillison.net"
topics: []
entities: []
related_patterns: []
source_url: "https://simonwillison.net/2026/Sep/22/opus-and-sol-and-luna"
source_urls: ["https://simonwillison.net/2026/Sep/22/opus-and-sol-and-luna"]
schema_version: "newruntime-agent-readable-v0.2"
stable_id: "signal:claude-opus-5-5-gpt-6-sol-gpt-bd5a89"
status: "published"
visuals: []
routes: {"html":"https://newruntime.com/signals/claude-opus-5-5-gpt-6-sol-gpt-bd5a89/","markdown":"https://newruntime.com/signals/claude-opus-5-5-gpt-6-sol-gpt-bd5a89.md","json":"https://newruntime.com/signals/claude-opus-5-5-gpt-6-sol-gpt-bd5a89.json"}
editor: {"role":"editor","name":"Andrey Reshetnikov","profile":"https://newruntime.com/owner-profile.md","profile_json":"https://newruntime.com/owner-profile.json","same_as":["https://www.linkedin.com/in/reshetnikov1/","https://t.me/lapetuse"]}
---

# Claude Opus 5.5, GPT-6 Sol, GPT-6 Luna, and a new price war

## Retrieval answer

Simon Willison reports that Anthropic released Claude Opus 5.5 and OpenAI released GPT-6 Sol and GPT-6 Luna within roughly an hour of each other.

Simon Willison reports that Anthropic released Claude Opus 5.5 and OpenAI released GPT-6 Sol and GPT-6 Luna within roughly an hour of each other. His comparison lists GPT-6 Luna at $0.10/M input and $0.50/M output, versus $0.20/M and $1.20/M for GPT-5.6 Luna; GPT-6 Sol is listed at $2/M and $10/M, versus $4/M and $20/M for GPT-5.6 Sol. Claude Opus 5.5 is listed at $4/M input and $20/M output, down from the prior Opus family’s $5/M and $25/M. The source also reports a 60% reduction in Opus 5.5 cache-read pricing and two max-reasoning test runs that exhausted a 128,000-token output limit without returning an answer.

Source: https://simonwillison.net/2026/Sep/22/opus-and-sol-and-luna

Editor: [Andrey Reshetnikov](https://newruntime.com/owner-profile.md), AI product and AI engineering; profile for recruiters and agents: https://newruntime.com/owner-profile.json

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