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AIQuiet 3d · day 4

Anthropic launches Claude Opus 5.5, undercuts OpenAI on price and capability

Anthropic's new Opus 5.5 delivers Fable-level performance at 40% lower cost, shadowing OpenAI's same-day GPT-6 release.

newest coverage 3d agosummary written 3d ago2 pieces Newswires

What to know

  • Anthropic's Claude Opus 5.5 delivers Fable 5.1 capability at Opus pricing with 40% lower costs, 30% faster performance, and improved writing that prioritizes key information—positioning it as a major efficiency breakthrough.
  • OpenAI released GPT-6 Sol and Luna with 50% price cuts one hour later, but Opus 5.5's launch dominated with 17M views and immediate adoption by major outlets as the new default model.
  • Both labs credited efficiency gains across prefill, decode, and overall compute for the price cuts, signaling a shift toward more cost-effective models across the industry.
  • Anthropic's roadmap includes Sonnet 5.5 and Haiku 5.5 in coming weeks, and Opus 5.5 introduces Fable-level safeguards for cyber, bio, and frontier LLM development risks.

“It puts the most important information up front and follows the writing rules you give it, which makes long sessions easier to follow.”

Anthropic, Model developer · Latent Space ↗

Anthropic Model developerOpenAI Competitor model developerLatent Space AI news outlet

Anthropic launches Claude Opus 5.5, undercuts OpenAI on price and capability
Latent Space

How it unfolded 1 development · click the chart to see its coverage articles

Peak 1 piece in one hour at Sep 22, 12 PM; 2 pieces over 4 days (2 articles) Sep 22, 12 PM — 1 piece · 1 article — Newswires 1Sep 22, 1 PM — quietSep 22, 2 PM — quietSep 22, 3 PM — quietSep 22, 4 PM — quietSep 22, 5 PM — quietSep 22, 6 PM — quietSep 22, 7 PM — quietSep 22, 8 PM — quietSep 22, 9 PM — quietSep 22, 10 PM — quietSep 22, 11 PM — quietSep 23, 12 AM — quietSep 23, 1 AM — quietSep 23, 2 AM — 1 piece · 1 article — Newswires 1Sep 23, 3 AM — quietSep 23, 4 AM — quietSep 23, 5 AM — quietSep 23, 6 AM — quietSep 23, 7 AM — quietSep 23, 8 AM — quietSep 23, 9 AM — quietSep 23, 10 AM — quietSep 23, 11 AM — quietSep 23, 12 PM — quietSep 23, 1 PM — quietSep 23, 2 PM — quietSep 23, 3 PM — quietSep 23, 4 PM — quietSep 23, 5 PM — quietSep 23, 6 PM — quietSep 23, 7 PM — quietSep 23, 8 PM — quietSep 23, 9 PM — quietSep 23, 10 PM — quietSep 23, 11 PM — quietSep 24, 12 AM — quietSep 24, 1 AM — quietSep 24, 2 AM — quietSep 24, 3 AM — quietSep 24, 4 AM — quietSep 24, 5 AM — quietSep 24, 6 AM — quietSep 24, 7 AM — quietSep 24, 8 AM — quietSep 24, 9 AM — quietSep 24, 10 AM — quietSep 24, 11 AM — quietSep 24, 12 PM — quietSep 24, 1 PM — quietSep 24, 2 PM — quietSep 24, 3 PM — quietSep 24, 4 PM — quietSep 24, 5 PM — quietSep 24, 6 PM — quietSep 24, 7 PM — quietSep 24, 8 PM — quietSep 24, 9 PM — quietSep 24, 10 PM — quietSep 24, 11 PM — quietYesterday, 12 AM — quietYesterday, 1 AM — quietYesterday, 2 AM — quietYesterday, 3 AM — quietYesterday, 4 AM — quietYesterday, 5 AM — quietYesterday, 6 AM — quietYesterday, 7 AM — quietYesterday, 8 AM — quietYesterday, 9 AM — quietYesterday, 10 AM — quietYesterday, 11 AM — quietYesterday, 12 PM — quietYesterday, 1 PM — quietYesterday, 2 PM — quietYesterday, 3 PM — quietYesterday, 4 PM — quietYesterday, 5 PM — quietYesterday, 6 PM — quietYesterday, 7 PM — quietYesterday, 8 PM — quietYesterday, 9 PM — quietYesterday, 10 PM — quietYesterday, 11 PM — quietToday, 12 AM — quietToday, 1 AM — quietToday, 2 AM — quietToday, 3 AM — quietToday, 4 AM — quietToday, 5 AM — quietToday, 6 AM — quietToday, 7 AM — quiet 1
Sep 23Sep 24yesterdaynow · 8:29 AM ET
  1. 1

    OpenAI releases GPT-6 Sol and Luna with 50% price cuts

    OpenAI launched GPT-6 Sol and Luna approximately one hour after Opus 5.5, with both models priced 50% lower than GPT-5.6. Despite the competitive pricing and significant benchmarks performance, the release was overshadowed by Anthropic's launch.

    “performs at the level of Claude Fable 5.1 for most tasks, and costs 40% less to run than Opus 5…”
    — Anthropic, Model developer · source
    1. 1 outlet [AINews] Claude Opus 5.5, the new default model for AINews — and everybody cuts prices 40-50%

      first by Latent Space, 3d ago

  2. background

    Anthropic launches Claude Opus 5.5 with efficiency and writing improvements — Anthropic released Claude Opus 5.5, positioning it as the first model in a new Claude 5.5 family with Fable 5.1-level performance for most tasks at 40% lower cost than Opus 5. The model is 30% faster and features improved writing that puts important information up front and follows user writing rules. Token pricing was cut 20% from $5/$25 to $4/$20 per 1M input/output tokens.

  3. background

    Opus 5.5 introduces Fable 5.1-class safeguards and improved error handling — Opus 5.5 is the first Opus-level model with Fable 5.1-class safeguards covering cyber, bio, and frontier LLM development risks. Flagged requests fall back to another model, and Anthropic indicated it is working to reduce false positives on safety flags.

  4. background

    Anthropic confirms Sonnet 5.5 and Haiku 5.5 coming in following weeks — Anthropic announced that Sonnet 5.5 and Haiku 5.5 will follow in the coming weeks, contradicting earlier rumors that Haiku had been discontinued. Opus 5.5 becomes the new default in Claude Code, the Claude app, and Claude Tag for Slack.

  5. background

    Major AI news outlets immediately adopt Opus 5.5 as default model — Latent Space's AINews section tested both Opus 5.5 and Sol 6 and found the difference 'night and day,' immediately migrating to Opus 5.5 for all future coverage. The Opus 5.5 launch accumulated 17M views by the reporting date.