AI Agents Now Start 4 in 10 Pull Requests on GitHub. The Bottleneck Has Moved to Review

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GitHub’s Octoverse 2026 says more than 40% of pull requests in September started with an AI agent’s first draft, up from 17% in March. What GitHub actually counted, why a 90% merge rate is not a quality score, what Copilot code review Max, approvals and Fusion cost, who answers for agent code that ships, and what it means for companies and developers.
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GPT-6.1 Terra Is Cheap per Task. In Our Newsroom Test, Its Max Setting Was the Worst

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OpenAI’s GPT-6.1 Terra costs $1 / $5 per million tokens and sits between Luna and Sol. Artificial Analysis scores it at 48 for $0.40 per task at max effort, against $0.72 for Sol and $5.98 for Claude Opus 5.5, and its six effort settings span a 7-fold cost range. In my own newsroom test (12 articles per language), Terra without reasoning matched GPT-6.1 Sol, and max was its worst setting. Why price per token is the wrong number, and what companies and users should do.
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The AI Price War: OpenAI and Anthropic Slash Prices and Fight for Each Other’s Customers. Read the Fine Print Before You Sign

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OpenAI’s Sol output price fell from $30 to $10 per million tokens since June, Anthropic cut Opus and Sonnet, and The Information reports OpenAI is using discounts to win Anthropic’s biggest customers. What the 90 percent headline really means, why prices are falling, how seat minimums, usage allowances and credits are shifting on both sides, and what companies and users should do now.
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