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Anthropic, PBC operates as an AI safety and research company. The Company builds reliable, interpretable, and steerable AI systems. Anthropic serves customers in the United States.

<ul><li>In the week ending September 27, Claude Opus mentions rose 91.1% from the prior week, while GPT-6 mentions fell 42.1% .</li><li>The Opus move was concentrated in the latest week with the release of Opus 5.5 .</li><li>Its tracked mentions had risen 11.9% in the week ending September 20, then accelerated to 91.1% in the week ending September 27.</li></ul>

In the week ending September 27, Claude Opus mentions rose 91.1% from the prior week, while GPT-6 mentions fell 42.1% .The Opus move was concentrated in the latest week with the release of Opus 5.5 .Its tracked mentions had risen 11.9% in the week ending September 20, then accelerated to 91.1% in the week ending September 27.

Claude Opus and GPT-6 diverge in GitHub mentions

OpenAI, L.P. operates as a software company. The Company specializes in AI research and deployment that aims to ensure that artificial general intelligence benefits all of humanity. OpenAI serves customers worldwide.

<ul><li>In 102 posts about Muse and competing tools, OpenAI was named most often (32 posts), followed by Google / Gemini (28) and Claude (15).</li><li>The posts show different levels of switching: 24 claimed a direct switch or reduced use of another tool, 6 expressed intent to switch, and 60 compared Muse with another tool on a task.</li><li>Some of those comparisons described choosing Muse for that task, even without claiming a broader switch. </li></ul>

In 102 posts about Muse and competing tools, OpenAI was named most often (32 posts), followed by Google / Gemini (28) and Claude (15).The posts show different levels of switching: 24 claimed a direct switch or reduced use of another tool, 6 expressed intent to switch, and 60 compared Muse with another tool on a task.Some of those comparisons described choosing Muse for that task, even without claiming a broader switch. 

Meta Muse: Switching Reports and Task Activity

Equity Bottom-Up

<ul><li>OpenAI’s public GitHub activity reached a new high in August 2026, with 3.96 million lines changed - up 119.5% month over month - and 3,543 commits, up 71.4%.</li><li>That made August OpenAI’s most active month in the observed period across both measures. OpenAI recorded approximately three times as many lines changed as Anthropic and 27% more commits during the month.</li><li>Anthropic also saw a meaningful increase in the size of its public code changes.</li></ul>

OpenAI’s public GitHub activity reached a new high in August 2026, with 3.96 million lines changed - up 119.5% month over month - and 3,543 commits, up 71.4%.That made August OpenAI’s most active month in the observed period across both measures. OpenAI recorded approximately three times as many lines changed as Anthropic and 27% more commits during the month.Anthropic also saw a meaningful increase in the size of its public code changes.

OpenAI’s Public GitHub Activity Hit a Record in August

<ul><li>OpenAI’s Codex is separating from Anthropic’s Claude Code in B2B adoption.</li><li>TickerTrends’ weighted trailing 12-month adoption data shows Codex reaching approximately 550% year-over-year growth in August, up from roughly 365% in May .</li><li>That represents a 183-point increase in its year-over-year adoption rate over the past three months.</li></ul>

OpenAI’s Codex is separating from Anthropic’s Claude Code in B2B adoption.TickerTrends’ weighted trailing 12-month adoption data shows Codex reaching approximately 550% year-over-year growth in August, up from roughly 365% in May .That represents a 183-point increase in its year-over-year adoption rate over the past three months.

Codex Pulls Ahead as B2B Adoption Accelerates

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OpenAI model mentions reached 13K/day, with GPT-5.6 representing 84% of current model-family mentions.
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GPT-5.6 reached 11K mentions/day, up 119.9% WoW and 300.9% MoM. Within the GPT-5.6 family, Sol leads at 3K/day, increasing 113.4% WoW and 76.5% MoM.
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Meanwhile, older model families have declined, with GPT-5.5 down 72.0% MoM and GPT-5.4 down 49.0% MoM.
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OpenAI model mentions reached 13K/day, with GPT-5.6 representing 84% of current model-family mentions.


GPT-5.6 reached 11K mentions/day, up 119.9% WoW and 300.9% MoM. Within the GPT-5.6 family, Sol leads at 3K/day, increasing 113.4% WoW and 76.5% MoM.


Meanwhile, older model families have declined, with GPT-5.5 down 72.0% MoM and GPT-5.4 down 49.0% MoM.



OpenAI and Anthropic Model Usage in GitHub Commits

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