diff --git a/content/copilot/reference/ai-models/model-comparison.md b/content/copilot/reference/ai-models/model-comparison.md
index a9d5cd85e4ad..861d6534c3ab 100644
--- a/content/copilot/reference/ai-models/model-comparison.md
+++ b/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.                                                                                   |
diff --git a/content/copilot/reference/ai-models/model-hosting.md b/content/copilot/reference/ai-models/model-hosting.md
index ddfefd63b928..d8a97d52de74 100644
--- a/content/copilot/reference/ai-models/model-hosting.md
+++ b/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.
 
diff --git a/content/copilot/reference/ai-models/supported-models.md b/content/copilot/reference/ai-models/supported-models.md
index cf7312bce35a..eeb1eec93c4b 100644
--- a/content/copilot/reference/ai-models/supported-models.md
+++ b/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).
diff --git a/data/reusables/copilot/gpt-55-promo-period.md b/data/reusables/copilot/gpt-55-promo-period.md
new file mode 100644
index 000000000000..a5d0647e207c
--- /dev/null
+++ b/data/reusables/copilot/gpt-55-promo-period.md
@@ -0,0 +1 @@
+> [!IMPORTANT] {% data variables.copilot.copilot_gpt_55 %} is available at a promotional multiplier of 7.5x.
diff --git a/data/tables/copilot/model-comparison.yml b/data/tables/copilot/model-comparison.yml
index 0d6446016cb7..34a42c5d0705 100644
--- a/data/tables/copilot/model-comparison.yml
+++ b/data/tables/copilot/model-comparison.yml
@@ -42,6 +42,11 @@
   excels_at: Codebase exploration and is especially effective when using grep-style tools
   further_reading: 'Not available'
 
+- name: GPT-5.5
+  task_area: Deep reasoning and debugging
+  excels_at: Multi-step problem solving and architecture-level code analysis
+  further_reading: 'Not available'
+
 # Anthropic
 - name: Claude Haiku 4.5
   task_area: Fast help with simple or repetitive tasks
@@ -56,7 +61,7 @@
 - name: Claude Opus 4.7
   task_area: Deep reasoning and debugging
   excels_at: Complex problem-solving challenges, sophisticated reasoning
-  further_reading: 'Not available'
+  further_reading: '[Claude Opus 4.7 model card](https://cdn.sanity.io/files/4zrzovbb/website/037f06850df7fbe871e206dad004c3db5fd50340.pdf)'
 
 - name: Claude Sonnet 4.0
   task_area: Deep reasoning and debugging
diff --git a/data/tables/copilot/model-multipliers.yml b/data/tables/copilot/model-multipliers.yml
index 403102ef1188..1c3e6b0ce757 100644
--- a/data/tables/copilot/model-multipliers.yml
+++ b/data/tables/copilot/model-multipliers.yml
@@ -89,6 +89,10 @@
   multiplier_paid: 0.25
   multiplier_free: Not applicable
 
+- name: GPT-5.5
+  multiplier_paid: 7.5
+  multiplier_free: Not applicable
+
 - name: Grok Code Fast 1
   multiplier_paid: 0.25
   multiplier_free: 1
diff --git a/data/tables/copilot/model-release-status.yml b/data/tables/copilot/model-release-status.yml
index 51891c307f3f..00dc55a9d2a9 100644
--- a/data/tables/copilot/model-release-status.yml
+++ b/data/tables/copilot/model-release-status.yml
@@ -74,6 +74,13 @@
   ask_mode: true
   edit_mode: true
 
+- name: 'GPT-5.5'
+  provider: 'OpenAI'
+  release_status: 'GA'
+  agent_mode: true
+  ask_mode: true
+  edit_mode: true
+
 # Anthropic models
 - name: 'Claude Haiku 4.5'
   provider: 'Anthropic'
diff --git a/data/tables/copilot/model-supported-clients.yml b/data/tables/copilot/model-supported-clients.yml
index 32a6c0f50631..0eb85cbe7841 100644
--- a/data/tables/copilot/model-supported-clients.yml
+++ b/data/tables/copilot/model-supported-clients.yml
@@ -185,6 +185,15 @@
   xcode: false
   jetbrains: false
 
+- name: GPT-5.5
+  dotcom: true
+  cli: true
+  vscode: true
+  vs: true
+  eclipse: true
+  xcode: true
+  jetbrains: true
+
 - name: Grok Code Fast 1
   dotcom: true
   cli: false
diff --git a/data/tables/copilot/model-supported-plans.yml b/data/tables/copilot/model-supported-plans.yml
index 9a5d72b62d34..825062328ed8 100644
--- a/data/tables/copilot/model-supported-plans.yml
+++ b/data/tables/copilot/model-supported-plans.yml
@@ -165,6 +165,14 @@
   business: true
   enterprise: true
 
+- name: GPT-5.5
+  free: false
+  student: false
+  pro: false
+  pro_plus: true
+  business: true
+  enterprise: true
+
 - name: Grok Code Fast 1
   free: true
   student: true
diff --git a/data/variables/copilot.yml b/data/variables/copilot.yml
index d51dcb12497a..06f7c8920d40 100644
--- a/data/variables/copilot.yml
+++ b/data/variables/copilot.yml
@@ -176,6 +176,7 @@ copilot_gpt_53_codex: 'GPT-5.3-Codex'
 copilot_gpt_54: 'GPT-5.4'
 copilot_gpt_54_mini: 'GPT-5.4 mini'
 copilot_gpt_54_nano: 'GPT-5.4 nano'
+copilot_gpt_55: 'GPT-5.5'
 # OpenAI 'o' series:
 copilot_o3: 'o3'
 copilot_o4_mini: 'o4-mini'