Expired50% confidenceFactExact time
The Anthropic paper states that Mythos improved Claude Code's success rate on open-ended engineering tasks from 40% to nearly 70%.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
7/2/2026
First Seen
Valid until: 9/30/2026(expired)
Sources
From Claude Oceanus to GPT-5.6: A Complete Breakdown of This Week's Major AI Model Updates
bilibiliAI_Express6/6/2026
Related Claims
UnverifiedAt the time of its release, Claude Code achieved a significant leap in the amount of work a programming assistant can independently complete.66% similarUnverifiedHaving Claude Code read through the entire project codebase and generate a flowchart before starting a major task can bring the AI's understanding of the system to 70%–80%.66% similarUnverifiedAfter adopting Claude Code, each Anthropic engineer's code output increased by approximately 250%, while maintaining stable code quality and reliability.65% similarUnverifiedClaude Code achieved a score of 80.8% on SWE Bench, topping the rankings in programming capability.65% similarUnverified40% of the code in Anthropic's Claude Code open-source repository is related to the Harness.65% similar
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