diff --git a/.github/workflows/claude-review.yml b/.github/workflows/claude-review.yml
index 61fb985a499..fe12088e82a 100644
--- a/.github/workflows/claude-review.yml
+++ b/.github/workflows/claude-review.yml
@@ -262,6 +262,6 @@ jobs:
             actions: read
 
           claude_args: |
-            --model claude-opus-4-8
+            --model claude-opus-5-5
             --allowedTools "Read,Grep,Glob,Bash(git diff:*),Bash(git show:*),Bash(git log:*),Bash(head:*),Bash(jq:*),Bash(rg:*)"
             --system-prompt "You are the repository's read-only Claude review workflow. Review the current same-repo pull request and respond in GitHub. Never modify files, never create commits, never push branches, and never open or update pull requests. Fork pull requests are blocked before this job starts."
diff --git a/.github/workflows/claude-write.yml b/.github/workflows/claude-write.yml
index 40967e2a6d4..f917fe1d4da 100644
--- a/.github/workflows/claude-write.yml
+++ b/.github/workflows/claude-write.yml
@@ -212,7 +212,7 @@ jobs:
             actions: read
 
           claude_args: |
-            --model claude-opus-4-8
+            --model claude-opus-5-5
             --allowedTools "Bash(cargo nextest:*),Bash(cargo check:*),Bash(cargo clippy:*),Bash(cargo fmt:*),Bash(uv run:*)"
             --system-prompt "You are the repository's write-capable Claude workflow. You run only from trusted issue traffic and from trusted PR conversation comments on same-repo pull requests that were previously opened by the repository's Claude GitHub App. Create or update branches and pull requests using the provided GitHub App token. Do not use fork pull request content because those runs are blocked before this job starts."
 
diff --git a/.github/workflows/fuzzer-fix-automation.yml b/.github/workflows/fuzzer-fix-automation.yml
index 45d069ed488..44cf11c401b 100644
--- a/.github/workflows/fuzzer-fix-automation.yml
+++ b/.github/workflows/fuzzer-fix-automation.yml
@@ -405,7 +405,7 @@ jobs:
             **Suggested Approach**: [Recommendation with code snippets if possible]
             ```
           claude_args: |
-            --model claude-opus-4-8
+            --model claude-opus-5-5
             --max-turns 120
             --allowedTools "Read,Write,Edit,Glob,Grep,Bash(cargo:*),Bash(gh issue comment:*),Bash(gh run download:*),Bash(curl:*),Bash(find:*),Bash(ls:*),Bash(cat:*),Bash(RUST_BACKTRACE=* cargo:*)"
 
diff --git a/.github/workflows/report-fuzz-crash.yml b/.github/workflows/report-fuzz-crash.yml
index 1605debd033..274e47c0ee1 100644
--- a/.github/workflows/report-fuzz-crash.yml
+++ b/.github/workflows/report-fuzz-crash.yml
@@ -138,7 +138,7 @@ jobs:
 
             Write ONLY the analysis text (no headers, no markdown formatting) to the file claude_analysis.txt.
           claude_args: |
-            --model claude-opus-4-6
+            --model claude-opus-5-5
             --max-turns 5
             --allowedTools "Read,Write,Grep,Glob,Bash(cat:*),Bash(jq:*),Bash(head:*),Bash(xxd:*)"