[pull] main from github:main

content/copilot/how-tos/copilot-cli/manage-pull-requests.md

@@ -156,7 +156,7 @@ When resolving conflicts, {% data variables.copilot.copilot_cli_short %} needs t
 
 To set a default merge strategy so that you are not prompted each time, add the `mergeStrategy` setting to your configuration file. You can set this in your personal user settings for {% data variables.product.prodname_copilot_short %}, or in the repository settings.
 
-* **User settings**: Add `"mergeStrategy": "rebase"` or `"mergeStrategy": "merge"` to your user-level configuration file (typically `~/.copilot/config.json`).
+* **User settings**: Add `"mergeStrategy": "rebase"` or `"mergeStrategy": "merge"` to your user-level configuration file (typically `~/.copilot/settings.json`).
 * **Repository settings**: Add the same setting to `.github/copilot/settings.json` in your repository root.
 
 ## Fixing CI failures

content/copilot/how-tos/copilot-cli/set-up-copilot-cli/authenticate-copilot-cli.md

@@ -67,7 +67,7 @@ By default, the CLI stores your OAuth token in your operating system's keychain
 | Windows | Credential Manager |
 | Linux | libsecret (GNOME Keyring, KWallet) |
 
-If the system keychain is unavailable—for example, on a headless Linux server without `libsecret` installed—the CLI prompts you to store the token in a plaintext configuration file at `~/.copilot/config.json`.
+If the system keychain is unavailable—for example, on a headless Linux server without `libsecret` installed—the CLI prompts you to store the token in a plaintext configuration file at `~/.copilot/settings.json`.
 
 When you run a command, {% data variables.copilot.copilot_cli_short %} checks for credentials in the following order:
 

content/copilot/how-tos/copilot-cli/set-up-copilot-cli/configure-copilot-cli.md

@@ -41,10 +41,10 @@ If you choose to trust the directory for future sessions, the trusted directory
 
 You can edit the list of permanently trusted directories.
 
-1. Open the CLI’s `config.json` file. By default, it’s stored in a `.copilot` folder under your home directory:
+1. Open the CLI’s `settings.json` file. By default, it’s stored in a `.copilot` folder under your home directory:
 
-   * **macOS/Linux**: `~/.copilot/config.json`
-   * **Windows**: `$HOME\.copilot\config.json`
+   * **macOS/Linux**: `~/.copilot/settings.json`
+   * **Windows**: `$HOME\.copilot\settings.json`
 
   You can change the config location by setting the `COPILOT_HOME` environment variable.
 

content/copilot/how-tos/copilot-cli/steer-remotely.md

@@ -58,7 +58,7 @@ Details for accessing the session remotely are displayed when the interactive se
 
 ### Configuring remote access to always be enabled
 
-If you always want your interactive CLI sessions to be remotely accessible, add the following to your {% data variables.product.prodname_copilot_short %} configuration file (typically located at `~/.copilot/config.json`):
+If you always want your interactive CLI sessions to be remotely accessible, add the following to your {% data variables.product.prodname_copilot_short %} configuration file (typically located at `~/.copilot/settings.json`):
 
 ```json copy
 {

content/copilot/how-tos/copilot-cli/use-copilot-cli-agents/overview.md

@@ -271,7 +271,7 @@ For additional information use one of the following commands in your terminal:
 
   `copilot help config`
 
-  You can adjust the configuration settings by editing the `config.json` file, which is located, by default, in the `~/.copilot` directory. This location can be changed by setting the `COPILOT_HOME` environment variable.
+  You can adjust the configuration settings by editing the `settings.json` file, which is located, by default, in the `~/.copilot` directory. This location can be changed by setting the `COPILOT_HOME` environment variable.
 
 * **Environment variables** that affect {% data variables.copilot.copilot_cli_short %}:
 

content/copilot/reference/ai-models/model-comparison.md

@@ -89,7 +89,7 @@ These models are designed for tasks that require step-by-step reasoning, complex
 | Model                                                 | Why it's a good fit                                                                                                                                             |
 |-------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------|
 | {% data variables.copilot.copilot_gpt_5_mini %}       | Delivers deep reasoning and debugging with faster responses and lower resource usage than GPT-5. Ideal for interactive sessions and step-by-step code analysis. |
-| {% data variables.copilot.copilot_gpt_54 %}           | Great at complex reasoning, code analysis, and technical decision-making.                                                                                       |
+| {% data variables.copilot.copilot_gpt_55 %}           | Great at complex reasoning, code analysis, and technical decision-making.                                                                                       |
 | {% data variables.copilot.copilot_claude_sonnet_46 %} | Improves on Sonnet 4.5 with more reliable completions and smarter reasoning under pressure.                                                                     |
 | {% data variables.copilot.copilot_claude_opus_47 %}   | Anthropic’s most powerful model. Improves on {% data variables.copilot.copilot_claude_opus_46 %}.                                                               |
 | {% data variables.copilot.copilot_gemini_31_pro %}    | Advanced reasoning across long contexts and scientific or technical analysis.                                                                                   |

content/copilot/reference/ai-models/model-hosting.md

@@ -16,6 +16,8 @@ contentType: reference
 
 ## OpenAI models
 
+{% data reusables.copilot.gpt-55-promo-period %}
+
 Used for:
 
 * {% data variables.copilot.copilot_gpt_41 %}
@@ -26,6 +28,7 @@ Used for:
 * {% data variables.copilot.copilot_gpt_54 %}
 * {% data variables.copilot.copilot_gpt_54_mini %}
 * {% data variables.copilot.copilot_gpt_54_nano %}
+* {% data variables.copilot.copilot_gpt_55 %}
 
 These models are hosted by OpenAI and {% data variables.product.github %}'s Azure infrastructure.
 

content/copilot/reference/ai-models/supported-models.md

@@ -107,6 +107,8 @@ The following table shows which AI models are available in each {% data variable
 
 {% data reusables.copilot.opus-47-promo-period %}
 
+{% data reusables.copilot.gpt-55-promo-period %}
+
 Each model has a premium request multiplier, based on its complexity and resource usage. If you are on a paid {% data variables.product.prodname_copilot_short %} plan, your premium request allowance is deducted according to this multiplier.
 
 For more information about premium requests, see [AUTOTITLE](/copilot/managing-copilot/monitoring-usage-and-entitlements/about-premium-requests).