--- title: "coglet Breaking Changes on PyPI | Since.dev" description: "What each coglet release removed, renamed or changed: 42 breaking changes in 19 versions on PyPI, each with its source." canonical_url: https://since.dev/packages/pypi/coglet last_updated: 2026-04-27 --- # coglet breaking changes Every breaking API change we have recorded in coglet on PyPI: 42 breaking changes in 19 versions. Below are its newest 6 versions, removals and renames first, each with its source. Newest change April 27, 2026 ## 0.19.0 1 breaking change, first published April 27, 2026. - **Default changed** Cog now generates prediction schemas statically from type annotations instead of importing the predictor at build time. To keep the old behavior if you hit issues, set COG_LEGACY_SCHEMA=1. [github.com](https://github.com/replicate/cog/releases/tag/v0.19.0) ## 0.18.0 2 breaking changes, first published April 16, 2026. - **Renamed** `cog run` cog run still works as a hidden alias that prints a deprecation warning. Update scripts to use cog exec. [github.com](https://github.com/replicate/cog/releases/tag/v0.18.0) - **Behavior changed** `record_metric` record_metric() rejects names that break the naming rules, and predict_time and the cog. prefix are reserved. Rename any metrics that use them. [github.com](https://github.com/replicate/cog/releases/tag/v0.18.0) ## 0.17.0-alpha2 5 breaking changes, first published March 25, 2026. - **Removed** Support for Python versions below 3.10 was ended in this pre-release. [github.com](https://github.com/replicate/cog/releases/tag/v0.17.0-alpha2) - **Removed** `cog migrate` The cog migrate command, pipelines functionality, and --x-localimage experimental flag were removed. [github.com](https://github.com/replicate/cog/releases/tag/v0.17.0-alpha2) - **Removed** `coglet-alpha` The option to select the coglet-alpha build was removed. [github.com](https://github.com/replicate/cog/releases/tag/v0.17.0-alpha2) - **Removed** `fast.monobase build system` The deprecated fast/monobase build system was removed; builds must use the current build path. [github.com](https://github.com/replicate/cog/releases/tag/v0.17.0-alpha2) - **Behavior changed** `cog.BaseModel` cog.BaseModel is now built on native Python dataclasses rather than Pydantic, which can change validation and serialization behavior. [github.com](https://github.com/replicate/cog/releases/tag/v0.17.0-alpha2) ## 0.8.0-beta1 1 breaking change, first published March 25, 2026. - **Behavior changed** Cog's supported Python versions were updated, so projects on older Python versions may no longer work. [github.com](https://github.com/replicate/cog/releases/tag/v0.8.0-beta1) ## 0.7.0-beta1 2 breaking changes, first published March 25, 2026. - **Removed** `QueueWorker` The QueueWorker class was renamed to Director. Code importing QueueWorker must switch to Director. [github.com](https://github.com/replicate/cog/releases/tag/v0.7.0-beta1) - **Behavior changed** Prediction and shutdown behavior changed, including SIGKILL on shutdown and JSON logging in production. [github.com](https://github.com/replicate/cog/releases/tag/v0.7.0-beta1) ## 0.6.0 1 breaking change, first published March 25, 2026. - **Behavior changed** The HTTP API was updated to use the new Worker class and respond like Replicate, which changes HTTP responses for existing clients. [github.com](https://github.com/replicate/cog/releases/tag/v0.6.0) ## Check your code These are the changes. To see which of them reach your code, [scan a public repository](https://since.dev/scan.md), or have your coding agent call `check_code` with your manifest or lockfile over [MCP](https://since.dev/docs.md#mcp). [The API](https://since.dev/docs.md#api) reads every change in every version, not only the newest. On Team and up, a fix pull request opens for the changes that reach a connected repository. Nothing merges or deploys. ## Put your code on continuous management. Scan a public repository now, or give your agent one line. ### See how out of date your code is. [Scan a repository](https://since.dev/scan.md). Any public GitHub repository. No sign-in. ### Tell your agent what changed since it was trained. `claude mcp add --transport http since https://api.since.dev/mcp` --- Every page on this site as Markdown: https://since.dev/sitemap.md. For agents: https://since.dev/llms.txt.