v2.1.31 Claude Code Release Notes

Feb 4, 2026

Claude's Analysisby Sonnet 4.6

Removes misleading provider pricing for Bedrock, Vertex, and Azure Foundry (debut); fixes temperatureOverride silently defaulting to 1 in streaming and PDF session lockups.

Changes

Total Changes (vs Average)

1.0×

Version Type

Patch

Release Focus

Mixed

Days Since Prior Release

Release # This Month

#2 of 28

Bug Fix Ratio

45%

Post-Release Edits

—

Change Category

Ecosystem Impact

Terminal rendering has received attention across 3 of the last 10 releases. This release's spinner jitter fix continues a pattern of streaming UI polish — alongside the provider story, with Azure Foundry debuting alongside Bedrock and Vertex in one cleanup sweep.

Key Themes

1Provider Pricing Removal (Breaking Change)|1Streaming Temperature Correctness|4Session-Destroying Bug Fixes|5Developer Experience Polish

May Help If You've Noticed

Your PDF uploads crash or freeze the session with no way to recover without starting a new conversation

Added2 changes

•Added session resume hint on exit, showing how to continue your conversation later
•Added support for full-width (zenkaku) space input from Japanese IME in checkbox selection

Improved3 changes

•Improved system prompts to more clearly guide the model toward using dedicated tools (Read, Edit, Glob, Grep) instead of bash equivalents (cat, sed, grep, find), reducing unnecessary bash command usage
•Improved PDF and request size error messages to show actual limits (100 pages, 20MB)
•Reduced layout jitter in the terminal when the spinner appears and disappears during streaming

Fixed5 changes

•Fixed PDF too large errors permanently locking up sessions, requiring users to start a new conversation
•Fixed bash commands incorrectly reporting failure with "Read-only file system" errors when sandbox mode was enabled
•Fixed a crash that made sessions unusable after entering plan mode when project config in ~/.claude.json was missing default fields
•Fixed temperatureOverride being silently ignored in the streaming API path, causing all streaming requests to use the default temperature (1) regardless of the configured override
•Fixed LSP shutdown/exit compatibility with strict language servers that reject null params

Removed1 change

•Removed misleading Anthropic API pricing from model selector for third-party provider (Bedrock, Vertex, Foundry) users

Improved3 changes

•Improved system prompts to more clearly guide the model toward using dedicated tools (Read, Edit, Glob, Grep) instead of bash equivalents (cat, sed, grep, find), reducing unnecessary bash command usage

•Improved PDF and request size error messages to show actual limits (100 pages, 20MB)

•Reduced layout jitter in the terminal when the spinner appears and disappears during streaming

Fixed5 changes

•Fixed PDF too large errors permanently locking up sessions, requiring users to start a new conversation

•Fixed bash commands incorrectly reporting failure with "Read-only file system" errors when sandbox mode was enabled

•Fixed a crash that made sessions unusable after entering plan mode when project config in ~/.claude.json was missing default fields

•Fixed temperatureOverride being silently ignored in the streaming API path, causing all streaming requests to use the default temperature (1) regardless of the configured override

•Fixed LSP shutdown/exit compatibility with strict language servers that reject null params

v2.1.31 Claude Code Release Notes

Changes in Claude Code v2.1.31

Added2 changes

Improved3 changes

Fixed5 changes

Removed1 change

v2.1.31 Claude Code Release Notes

Changes in Claude Code v2.1.31

Added2 changes

Improved3 changes

Fixed5 changes

Removed1 change