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Anthropic Releases Claude Opus 5.5 at 40% Lower Cost Than Previous Models

The company launched the new model, which matches Fable 5.1 performance while reducing running costs by 40 percent compared to Opus 5.

3 publishers · 3 articles · first seen 22 Sept 2026 · updated 45d ago

Headline and summary written by an AI model from the linked articles; not reviewed by a person. How this was made

First reported by marktechpost.com, 3h 51m ahead of the next publisher · who breaks stories first

This story has stopped developing; this page is its permanent record. More from that day

The odds

How the odds moved · Will the highest score achieved by an Anthropic Claude model on Humanity’s Last Exam in 2026 be 55% or higher?
0%50%100%100%21 Sept, 23:21 UTCnowBloomberg Technology: Anthropic Unveils Cheaper Claude Opus 5.5 Ahead of Expected IPO · 23 Sept, 16:19 UTCtheinformation.com: Anthropic releases cheaper model in first launch since slowdown calls · 22 Sept, 22:51 UTCmarktechpost.com: Anthropic Releases Claude Opus 5.5: Fable 5.1-Level Performance at 40% Lower Running Cost Than Opus 5 · 22 Sept, 18:59 UTC

Each tick is a source publishing on this story

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The story so far

3 publishers have covered this in 3 articles since 22 Sept 2026. marktechpost.com published first, on 22 September at 18:59 UTC; theinformation.com followed 3h 52m later. The most recent article, from Bloomberg Technology, appeared on 23 September at 16:19 UTC.

Outlets reporting it: Bloomberg Technology (major outlet), marktechpost.com, theinformation.com.

3 prediction markets price this story:

  • Will the highest score achieved by an Anthropic Claude model on Humanity’s Last Exam in 2026 be 55% or higher? — resolved “Yes” on 14 Oct 2026. The Yes outcome occurs if any Anthropic Claude model reaches at least 55% accuracy on Humanity’s Last Exam by December 31, 2026, at 11:59 PM ET. The No outcome applies if no such score is achieved within that deadline. Readers often mistake the linked news story about cost reductions as relevant evidence, but only the official HLE leaderboard determines the result.
  • Will Anthropic reset Claude usage limit by October 31? — resolved “Yes” on 23 Sept 2026. The market resolves to Yes if Anthropic takes discretionary action to zero or refill usage counters for paid subscription users before October 31 at 11:59 PM ET. Normal scheduled resets, temporary limit increases, and API rate limit changes do not count toward this outcome. Readers often mistake the release of a new model or standard pricing updates for a qualifying usage reset.
  • Will Anthropic have the best AI model at the end of September 2026? — resolved “Yes” on 1 Oct 2026. Anthropic wins if its model holds the top spot on the arena.ai Text Arena leaderboard at 12:00 PM ET on September 30, 2026. The ranking relies on the specific 'Text Arena | Overall' tab with style control turned off. Readers often mistake the check time for midnight or ignore the required setting adjustments.

Odds are the market's probability that the outcome happens, updated every few minutes. They are information about what traders expect, not a forecast we make and not investment advice.

How it unfolded

Every source in the order it published, with the odds on Will the highest score achieved by an Anthropic Claude model on Humanity’s Last Exam in 2026 be 55% or higher? at that moment. A dash means the source published before we started tracking prices.

  1. marktechpost.comAnthropic Releases Claude Opus 5.5: Fable 5.1-Level Performance at 40% Lower Running Cost Than Opus 585%
  2. theinformation.comAnthropic releases cheaper model in first launch since slowdown calls85%
  3. Bloomberg TechnologyAnthropic Unveils Cheaper Claude Opus 5.5 Ahead of Expected IPO89%▲3 points since the previous source
  4. Market resolved: Yes

Sources

Every article we clustered into this story. Headlines link to the publisher.

  1. Anthropic Unveils Cheaper Claude Opus 5.5 Ahead of Expected IPO Bloomberg Technology ·
  2. Anthropic releases cheaper model in first launch since slowdown calls theinformation.com
  3. Anthropic Releases Claude Opus 5.5: Fable 5.1-Level Performance at 40% Lower Running Cost Than Opus 5 marktechpost.com

Related prediction markets

Linked by software because they are about the same subject. Most ask a different question from the one this story reports, so read each market's own question. How often the link is right

  • Resolved Will the highest score achieved by an Anthropic Claude model on Humanity’s Last Exam in 2026 be 55% or higher? Yes 24d ago

    The market favoured Yes at 65% a day out, and it won. How often it's right

    Wrong market?

  • Resolved Will Anthropic reset Claude usage limit by October 31? Yes 45d ago

    The market favoured Yes at 90% a day out, and it won. How often it's right

    Wrong market?

  • Resolved Will Anthropic have the best AI model at the end of September 2026? Yes 37d ago
    Wrong market?

In this story

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