# Claude Code 2.1.283 Changelog

> Claude Code updates for September 25, 2026: improved gateway hints, model management, and error fixes for better user experience.
- Title: Claude Code 2.1.283 Changelog · Claude Code Docs | Shortify
- Summary: Claude Code updates for September 25, 2026: improved gateway hints, model management, and error fixes for better user experience. Claude Code 2.1.283 adds…
- Keywords: claude, code, gateway, model, management, tool, error, fix, prompt, audit, prompt-audit, claudemcp
- Source: Claude Code Docs — https://code.claude.com/docs/en/changelog
- Read time: 2 min
- Topics: claude, code, gateway, model, management, tool, error, fix, prompt, audit, prompt-audit, claudemcp
## New Gateway Hints
Added x-claude-code-prompt-id to gateway hint headers so LLM gateways can group requests for one user prompt.
## Model Management
Added availableModelsMatch managed setting to block new model releases until explicitly listed.
## Model Blocking
Added deniedModels managed setting to block specific models even when availableModels allows them.
## MCP Tool Outputs
Added MCP tool, WebFetch and WebSearch outputs to tool.output OpenTelemetry span events when OTEL_LOG_TOOL_CONTENT=1.
## Prompt Audit
Added /doctor prompt-audit to audit CLAUDE.md files, skills, agents and commands for older model prompting patterns.
## Truncated Messages
Added click-to-expand for truncated messages from other sessions in fullscreen mode.
## Plugin Errors
Added path to, plugin-dir load-failure entries in stream-json system/init plugin_errors.
## Load Testing
Added opt-in load_test_mode block to Claude apps gateway config for testing deployments without sending requests upstream.
## Amazon Bedrock
Added mantle upstream provider for Amazon Bedrock’s Mantle endpoint to Claude apps gateway.
## Session Fixes
Fixed SDK sessions losing deferred tool calls or finished tool results when a turn ended early.
## MCP Progress
Fixed MCP progress notifications being discarded once a long-running tool call moved to the background.
## MCP Server Fixes
Fixed stdio MCP servers being left running when the session ended while they were still starting.
## HTTP 404 Fixes
Fixed brief HTTP 404 from stateless remote MCP servers leaving them unusable for the rest of the session.
## Fable Limit
Fixed weekly Fable limit not appearing in /usage and VS Code usage meters when telemetry is disabled.
## Model Picker Fixes
Fixed /model picker showing hardcoded Haiku version and price when ANTHROPIC_DEFAULT_HAIKU_MODEL pins a different model.
## Dynamic Workflows
Fixed dynamic workflows started during model fallback running every agent on the fallback model instead of retrying configured model.
## Haiku Model Fixes
Fixed DISABLE_PROMPT_CACHING_HAIKU having no effect when Haiku is the session’s main model.
## Key takeaway

Claude Code 2.1.283 adds gateway hint headers for grouping user requests and fixes critical errors in model management and tool interactions.