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Anthropic's Clark Puts AI Self-Improvement at Over 60% by Late 2028

June 21, 2026 at 12:00 EDT

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Policy & Regulation
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Anthropic co-founder and head of Public Benefit Jack Clark and the company's Head of Economics Peter McCrory appeared on the latest episode of Bloomberg's Odd Lots podcast (published June 19, 2026, roughly 66 minutes) to discuss AI's impact on the labor market and society, existential risk and the company's approach to safety. The episode was hosted by Joe Weisenthal and Tracy Alloway. It is available via Bloomberg, Apple Podcasts and YouTube.

June 19, 2026 · Anthropic on Odd Lots

"60% chance AI builds a better AI by 2028"

Anthropic co-founder Jack Clark lays out the case for recursive self-improvement — AI autonomously building its own successor — pointing to an early signal: code output is already surging.

60%

estimated chance of full recursive self-improvement by end of 2028

≈8×

more lines of code merged in 2026 vs. prior years

66min

on labor markets, safety & existential risk

The early signal: code merged per year

Anthropic's main evidence for accelerating self-improvement — a roughly 8× jump in 2026.

1×

Prior years

≈8×

2026

Claude Fable 5 · Public

Safety classifiers on
Standard access route
$10 / 1M input · $50 / 1M output tokens

Claude Mythos 5 · Limited

Some classifiers removed
Vetted users via Project Glasswing
Same base capabilities

▲ Praised by developers

Strong on demanding reasoning, long-horizon agentic tasks, and coding; guardrails intercept offensive cyber and bioweapon queries.

▼ Points of debate

Tension between safety and usability; less-restricted Mythos 5 limited to vetted users; government access restrictions seen as possibly overly broad.

Policy backdrop

U.S. limits on foreign access caused temporary disruptions to Fable 5 and Mythos 5 — with foreign nationals blocked and full restoration still pending as of mid-June 2026.

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