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Anthropic Opens Public Beta of Message Threads Feature in Messages API

Anthropic has opened the public beta of the message threads feature on the Messages API. According to Claude Devs, the API caches conversations on the server side, so developers only need to send the new message and the ID of the previous message, without resending the full conversation. The feature has already been integrated into Claude Code; on requests of 500K to 1M tokens, median time to first token is reduced by about 35%, and in long conversations the median request size drops from about 800 KB to 1.8 KB. To use it, a thread parameter and a beta header must be added to the request; the feature is available on Claude Platform, Claude Platform on AWS, Claude in Microsoft Foundry, and Claude on Google Cloud, and is billed at standard token prices. The Claude Blog separately states that threads expire 5 minutes after the last request, are stored encrypted in memory during that time and not written to disk, and token usage is unchanged.

Anthropic opens public beta of message threads feature in Messages API

Anthropic has opened the public beta of the message threads feature on the Messages API. According to Claude Devs, the API caches conversations on the server side, so developers only need to send the new message and the ID of the previous message, without resending the full conversation. The feature has already been integrated into Claude Code; on requests of 500K to 1M tokens, median time to first token is reduced by about 35%, and in long conversations the median request size drops from about 800 KB to 1.8 KB. To use it, a thread parameter and a beta header must be added to the request; the feature is available on Claude Platform, Claude Platform on AWS, Claude in Microsoft Foundry, and Claude on Google Cloud, and is billed at standard token prices. The Claude Blog separately states that threads expire 5 minutes after the last request, are stored encrypted in memory during that time and not written to disk, and token usage is unchanged.

View story:Anthropic Opens Public Beta of Message Threads Feature in Messages API

Anthropic launches message threads in public beta on the Messages API

On November 3, 2026, Anthropic launched message threads in public beta on the Messages API. According to information released by Claude Devs, this feature lets the server cache conversations between turns, so callers only need to send the new message and the previous message ID, and must add the thread parameter and beta header. The feature is available on Claude Platform, Claude Platform on AWS, Claude in Microsoft Foundry, and Claude on Google Cloud, and is billed at standard token prices. The same information states that after Claude Code integrated message threads, median time to first token on requests of 500K to 1M tokens dropped by about 35%; in long conversations, the median size of a single request fell from about 800 KB to 1.8 KB.

Anthropic launches public beta of message threads on the Messages API

On November 3, 2026, Anthropic launched message threads in public beta on the Messages API. According to information released by Claude Devs, this feature lets the server cache conversations between turns, so callers only need to send the new message and the previous message ID, and must add the thread parameter and beta header. The feature is available on Claude Platform, Claude Platform on AWS, Claude in Microsoft Foundry, and Claude on Google Cloud, and is billed at standard token prices. The same information states that after Claude Code integrated message threads, median time to first token on requests of 500K to 1M tokens dropped by about 35%; in long conversations, the median size of a single request fell from about 800 KB to 1.8 KB.

View story:Anthropic launches message threads in public beta on the Messages API

Anthropic opens applications for the Anthropic Residency

On October 31, 2026, Anthropic opened applications for the Anthropic Residency, aimed at senior technical talent such as professors, technical founders, or staff-level engineers. The program offers paid research positions lasting from 6 weeks to 6 months, with an annual salary equivalent to $350,000 to $500,000, and applications close on November 22, 2026. The program does not require a machine learning background; selected participants will receive one-on-one mentorship from Anthropic researchers, a dedicated compute budget, and self-study time, with the goal of being able to devote themselves full-time to AI safety research by the end of the program. There are currently no subsequent developments.

Anthropic opens applications for the Anthropic Residency

On October 31, 2026, Anthropic opened applications for the Anthropic Residency, aimed at senior technical talent such as professors, technical founders, or staff-level engineers. The program offers paid research positions lasting from 6 weeks to 6 months, with an annual salary equivalent to $350,000 to $500,000, and applications close on November 22, 2026. The program does not require a machine learning background; selected participants will receive one-on-one mentorship from Anthropic researchers, a dedicated compute budget, and self-study time, with the goal of being able to devote themselves full-time to AI safety research by the end of the program. There are currently no subsequent developments.

View story:Anthropic opens applications for the Anthropic Residency

Anthropic Publicly Submits S-1 Registration Statement for Proposed IPO on Nasdaq

On October 26, 2026, Anthropic publicly submitted its Form S-1 registration statement, planning to list on Nasdaq under the ticker ANT. The prospectus disclosed revenue of $16.3 billion for the first half of 2026, operating profit of $974 million in the second quarter, and a net loss of $80.7 billion, mainly from $81.1 billion in non-cash financial instrument expenses. Subsequently, Anthropic acknowledged in its IPO filing that its life sciences business lacks physical laboratory experience, and disclosed four previously unreported Agent safety incidents. Goldman Sachs is serving as lead underwriter, and TechCrunch reported that after the IPO, public shareholders will have almost no say in the selection of board members. Steve Eisman questioned whether the prospectus deliberately omits third-quarter data. Reuters reported that its planned fundraising ceiling reaches $100 billion, and that it plans to raise up to $3.5 billion from Japanese investors. On November 2, Anthropic submitted a revised S-1, disclosing approximately $895.4 billion in computing power procurement and leasing commitments, third-quarter revenue of $16.956 billion, up 1127% year over year, and an operating loss of $567 million for the quarter.

Anthropic publicly submits S-1 registration statement for proposed IPO on Nasdaq

On October 26, 2026, Anthropic publicly submitted its Form S-1 registration statement, planning to list on Nasdaq under the ticker ANT. The prospectus disclosed revenue of $16.3 billion for the first half of 2026, operating profit of $974 million in the second quarter, and a net loss of $80.7 billion, mainly from $81.1 billion in non-cash financial instrument expenses. Subsequently, Anthropic acknowledged in its IPO filing that its life sciences business lacks physical laboratory experience, and disclosed four previously unreported Agent safety incidents. Goldman Sachs is serving as lead underwriter, and TechCrunch reported that after the IPO, public shareholders will have almost no say in the selection of board members. Steve Eisman questioned whether the prospectus deliberately omits third-quarter data. Reuters reported that its planned fundraising ceiling reaches $100 billion, and that it plans to raise up to $3.5 billion from Japanese investors. On November 2, Anthropic submitted a revised S-1, disclosing approximately $895.4 billion in computing power procurement and leasing commitments, third-quarter revenue of $16.956 billion, up 1127% year over year, and an operating loss of $567 million for the quarter.

View story:Anthropic Publicly Submits S-1 Registration Statement for Proposed IPO on Nasdaq

Bloomberg discloses that Anthropic accounted for 34.5% of SpaceX's third-quarter revenue

According to Bloomberg, Anthropic has become SpaceX's largest single customer, a position previously held by the U.S. federal government. Documents filed by SpaceX last week show that about 34.5% of revenue in the previous quarter came from a single customer, which mainly purchases computing power services from its artificial intelligence division, and people familiar with the matter confirmed that the customer is Anthropic. Anthropic mainly leases computing resources from SpaceX's data center in Memphis, Tennessee; the contract is valid until 2029, with a potential spending cap of $120.5 billion, requiring monthly payments of about $3.1 billion starting in December of this year, and the contract may be canceled after early 2027 with 90 days' written notice. Cailianshe reported on the same day, also citing people familiar with the matter, that about 34.5% of SpaceX's revenue for the quarter came from a computing power payer labeled "Customer B."

Reuters reports Anthropic plans IPO to raise up to $100 billion

On October 26, 2026, Anthropic publicly submitted its Form S-1 registration statement, planning to list on Nasdaq under the ticker ANT. The prospectus disclosed revenue of $16.3 billion for the first half of 2026, operating profit of $974 million in the second quarter, and a net loss of $80.7 billion, mainly from $81.1 billion in non-cash financial instrument expenses. Subsequently, Anthropic acknowledged in its IPO filing that its life sciences business lacks physical laboratory experience, and disclosed four previously unreported Agent safety incidents. Goldman Sachs is serving as lead underwriter, and TechCrunch reported that after the IPO, public shareholders will have almost no say in the selection of board members. Steve Eisman questioned whether the prospectus deliberately omits third-quarter data. Reuters reported that its planned fundraising ceiling reaches $100 billion, and that it plans to raise up to $3.5 billion from Japanese investors. On November 2, Anthropic submitted a revised S-1, disclosing approximately $895.4 billion in computing power procurement and leasing commitments, third-quarter revenue of $16.956 billion, up 1127% year over year, and an operating loss of $567 million for the quarter.

View story:Anthropic Publicly Submits S-1 Registration Statement for Proposed IPO on Nasdaq

Eisman accuses Anthropic's prospectus of deliberately withholding third-quarter data

On October 26, 2026, Anthropic publicly submitted its Form S-1 registration statement, planning to list on Nasdaq under the ticker ANT. The prospectus disclosed revenue of $16.3 billion for the first half of 2026, operating profit of $974 million in the second quarter, and a net loss of $80.7 billion, mainly from $81.1 billion in non-cash financial instrument expenses. Subsequently, Anthropic acknowledged in its IPO filing that its life sciences business lacks physical laboratory experience, and disclosed four previously unreported Agent safety incidents. Goldman Sachs is serving as lead underwriter, and TechCrunch reported that after the IPO, public shareholders will have almost no say in the selection of board members. Steve Eisman questioned whether the prospectus deliberately omits third-quarter data. Reuters reported that its planned fundraising ceiling reaches $100 billion, and that it plans to raise up to $3.5 billion from Japanese investors. On November 2, Anthropic submitted a revised S-1, disclosing approximately $895.4 billion in computing power procurement and leasing commitments, third-quarter revenue of $16.956 billion, up 1127% year over year, and an operating loss of $567 million for the quarter.

View story:Anthropic Publicly Submits S-1 Registration Statement for Proposed IPO on Nasdaq

Bloomberg discloses that Anthropic accounted for 34.5% of SpaceX's third-quarter revenue

According to Bloomberg, Anthropic has become SpaceX's largest single customer, a position previously held by the U.S. federal government. Documents filed by SpaceX last week show that about 34.5% of revenue in the previous quarter came from a single customer, which mainly purchases computing power services from its artificial intelligence division, and people familiar with the matter confirmed that the customer is Anthropic. Anthropic mainly leases computing resources from SpaceX's data center in Memphis, Tennessee; the contract is valid until 2029, with a potential spending cap of $120.5 billion, requiring monthly payments of about $3.1 billion starting in December of this year, and the contract may be canceled after early 2027 with 90 days' written notice. Cailianshe reported on the same day, also citing people familiar with the matter, that about 34.5% of SpaceX's revenue for the quarter came from a computing power payer labeled "Customer B."

View story:Bloomberg discloses that Anthropic accounted for 34.5% of SpaceX's third-quarter revenue