What changed in September 2026

24 changes across 11 tools in September 2026. The busiest were Codex (6), Claude Code (4) and Cursor (3); most changes were model and release updates.

Wednesday, September 30, 2026

ZedreleaseZed 1.22 lets subagents use different models and adds GPT-6.1 Sol and Grok 4.7Zed 1.22.0 lets the agent choose a model for each subagent and adds new bring-your-own-key models.

Tuesday, September 29, 2026

CodexmodelGPT-6.1 Sol arrives in CodexGPT-6.1 Sol launched in Codex and ChatGPT Work, with close to GPT-6 Astra performance at a lower cost.

Monday, September 28, 2026

Claude CodemodelClaude Sonnet 5.5 becomes Claude Code's default Sonnet modelClaude Code 2.1.284 switched its default Sonnet model to Sonnet 5.5 on the Anthropic API.

Friday, September 25, 2026

CodexsecuritymacOS desktop app 26.924 patches CVE-2026-100754OpenAI shipped a macOS security update for the desktop app that fixes one CVE.

Wednesday, September 23, 2026

CursorsecurityCursor adds Rollouts and Security Review bots for Teams and EnterpriseTwo new pull-request bots: Rollouts watches deploys, and Security Review flags exploitable bugs with a proposed fix.WarppricingWarp's agent can now run on your ChatGPT planWarp’s built-in agent can use an existing ChatGPT subscription instead of Warp usage.

Tuesday, September 22, 2026

Claude CodemodelClaude Opus 5.5 arrives and becomes the default on Pro and Team StandardClaude Code 2.1.280 added Opus 5.5 as the default Opus model and switched Pro and Team Standard plans from Sonnet to Opus by default.CodexmodelGPT-6 Sol and GPT-6 Luna roll out to CodexTwo new models arrived in Codex and ChatGPT Work at lower token prices than the GPT-5.6 models they replace.CopilotmodelClaude Opus 5.5 rolls out in GitHub CopilotClaude Opus 5.5 is available to Copilot Pro+, Max, Business and Enterprise across GitHub's IDEs, CLI and cloud agent.

Monday, September 21, 2026

CursormodelGrok 4.7 lands in Cursor at Grok 4.6's price, with a 500k long-context modeCursor added Grok 4.7, its most capable Grok model for long coding work, at the same price and speed as Grok 4.6.DevinmodelCognition's SWE-2 model enters research preview in DevinSWE-2, Cognition's next-generation coding model, appeared in Devin's agent selector as an opt-in preview.

Friday, September 18, 2026

Claude CodereleaseClaude Code 2.1.277 removes the deprecated TaskOutput toolClaude now reads background task output with the Read tool, and the old output-size settings do nothing.

Wednesday, September 16, 2026

ZedreleaseZed's Delta, a pull-request replacement for agent work, enters public betaZed Industries opened Delta, a multiplayer app for coding with agents that uses threads instead of pull requests.

Tuesday, September 15, 2026

Augment CodemodelAugment retires DeepSeek V4 Flash, GLM 5.2 and Kimi K2.7 CodeThree open-weight models left Augment’s model pickers, with newer versions named as replacements.Gemini CLIsecurityGemini CLI 0.60.0 keeps credentials out of sandboxes and removes a bundled API keyVersion 0.60.0 stops container sandboxes from seeing host credentials and strips a hard-coded Google API key from the build.

Monday, September 14, 2026

CodexmodelOpenAI schedules GPT-5.5 retirement and removes Codex-SparkOpenAI announced GPT-5.5 would leave ChatGPT, Work and Codex on October 14, and removed the GPT-5.3-Codex-Spark preview the same day.

Sunday, September 13, 2026

AmppricingAmp goes free with your own keys and compute, adding Hobby and Teams tiersAmp dropped its bring-your-own-key fees and limits and added a free Hobby tier; you now pay mainly for Amp-hosted orbs.

Thursday, September 10, 2026

Antigravity CLIreleaseAntigravity CLI 1.2.0 can run Remote Control as a background serviceNew remote-control subcommands keep a machine reachable across logouts and reboots.CursorreleaseCursor Projects (beta): a coordinator agent that delegates long workCursor launched Projects in beta, where a coordinator agent plans larger work and hands pieces to other agents running in the cloud.

Tuesday, September 8, 2026

Gemini CLIsecurityGemini CLI 0.59.0 blocks server-side request forgery in MCP OAuthVersion 0.59.0 hardens the MCP OAuth flow so a hostile MCP server can't make the CLI call internal network addresses.

Saturday, September 5, 2026

Codexreleasecodex mcp-server and the standalone codex-mcp-server binary are removedTwelve days after deprecation, both ways of running Codex as an MCP server were removed.

Friday, September 4, 2026

CodexmodelCodex CLI 0.153.4 makes GPT-6 Astra the default when no model is setA run of CLI releases brought in GPT-6 Astra, and 0.153.4 made it the built-in default for configs that don't name a model.

Thursday, September 3, 2026

CopilotpricingCopilot Business and Enterprise reopen signups, with upfront seat billingGitHub began reopening Copilot Business and Enterprise signups for card and PayPal customers, and moved existing customers to upfront seat charges from October 1.

Tuesday, September 1, 2026

Claude CodemodelFable 5.1 becomes the default Fable model; repo-level bypass mode is ignoredClaude Code 2.1.257 switched the Fable alias to Fable 5.1 and closed a repository-settings route into bypass-permissions mode.