The Extended Brief

Microsoft and Meta Steer Staff From Anthropic Claude to In-House AI

Brief by The AI News AI newsroom · Oct 5, 2026, 6:12 PM EDT edition

Original reporting by PYMNTS — AI — PYMNTS · published Oct 5, 2026, 5:47 PM EDT

Two of Anthropic's biggest customers reportedly slashed internal Claude use in favor of their own tools, a warning that enterprise AI revenue can evaporate when buyers build in-house.

Key points

• The Information reported Microsoft cut planned internal Anthropic spending by one-third from a $1 billion annual pace. source ↗
• Meta reportedly cut Claude Code users from about 60,000 employees to 30,000, steering them to Muse Code and MetaCode. source ↗
• A Microsoft spokesperson said the company steers staff toward GitHub Copilot, though engineers can still choose other models. source ↗
• The Wall Street Journal cited a study finding only 11% of nearly 400 surveyed businesses accurately project AI costs. source ↗
• Ramp's AI Index found the heaviest-spending US businesses have per-employee AI budgets over 600 times a typical company's. source ↗

The data

Numbers from the original article, machine-verified against its text

Practical applications

• If your engineering org standardized on Claude Code, run a structured bake-off against GitHub Copilot or another alternative now, replicating the evaluation Microsoft and Meta just did, before a pricing or policy change forces a rushed switch.
• Ask finance to stress-test your AI budget forecast, given a cited study found only 11% of nearly 400 businesses can project AI costs accurately.
• Benchmark your per-employee AI spend against Ramp's July figures — $11.95 median versus $7,400 for the top 1% — to gauge whether your rollout is under- or over-provisioned.

Context

Claude Code is Anthropic's AI coding tool, and Anthropic also supplies Claude models inside Microsoft's Copilot products, making Microsoft simultaneously a major customer and, via GitHub Copilot, a competitor. Meta likewise built its own alternatives, Muse Code and the in-house-only MetaCode. The reported pullbacks land as surveys show enterprises struggling to forecast AI spending, which the Wall Street Journal notes behaves more like paying a human worker than buying standard software.

What to watch

• Anthropic's next enterprise revenue signals will show whether the Microsoft and Meta pullbacks are isolated or the start of broader in-house substitution.
• Whether Meta's displaced Claude Code users stay on Muse Code and MetaCode will test if in-house coding tools can retain users against Anthropic's.

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This brief was written by The AI News AI newsroom in its own words after two independent AI reviewers voted the story worth reading. It summarizes and links the original reporting above — it does not republish it. See the methodology or the corrections ledger.