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Enhancements

  • Allow custom_multichannels.defaults to override default_channels. Continuation of effort to devendor conda and remove hardcoded "defaults" channel. (#14661)
  • Defer PrefixData record instantiation until they are accessed for faster query performance. (#14811)
  • Add support for Python 3.14. (#15080, [#15618])
  • Speed up the context initialization process by caching condarc file reads. (#15150)
  • Raise a NoChannelsConfiguredError when attempting to solve an environment with no channels configured, and provide a helpful message to guide users in adding channels. (#15262 via [#15345])
  • Add conda.cli.condarc.ConfigurationFile class to expose configuration file manipulation interface programmatically. This allows other Python interfaces to read and modify conda configuration files without shelling out to conda config commands. (#15238 via [#15376])
  • Add -s as a shorthand alias for conda run --no-capture-output. (#15426)
  • conda run now deactivates the environment on exiting the command. (#15427)
  • Rename conda.models.enums.PathType enum to conda.models.enums.PathEnum to resolve a naming conflict with the PathType type annotation. This change follows modern Python conventions and establishes the *Enum suffix as the pattern for enums in the codebase. (#15428)
  • Validate plugin-provided HTTP headers and raise PluginError if forbidden headers are detected, preventing plugins from compromising conda's network stack. (#15405 via [#15436])
  • Add conda_package_extractors plugin hook to allow plugins to register custom package archive extractors. (#15524 via [#15441])
  • Add -O as a flag alias for --override-channels. (#15499)
  • Add reusable http_test_server fixture to conda.testing module for serving mock conda channels and remote files in tests. Fixture uses standard @pytest.mark.parametrize() with indirect=True for configuring directories, supporting both pre-existing directories and dynamic content generation. Provides clean API with get_url() helper method and directory attribute. (#15528 via [#15529])
  • Speed up conda run by inlining environment activation instead of using a subprocess. (#15534)
  • Add a --size flag to the conda info --envs and conda env list commands to display disk usage for each environment. (#8040 and [#15544])
  • Add PrefixRecord.package_size() and PrefixData.size for programmatic access to conda-managed disk usage. (#15544)
  • Add --size flag to conda list to show environment size and package sizes. (#15544)
  • Improve error messages for HTTP 403 (Forbidden) responses with context-aware guidance on authentication and permissions. (#15594)
  • Improve error message when conda activate fails on Windows due to unwritable %TEMP% directory. (#15601 via [#15602])
  • Package extension detection is now dynamic based on registered conda_package_extractors plugins. (#15629)
  • Allow conda create --download-only to run without specifying -n/--name or -p/--prefix, similar to --dry-run. (#15633)
  • Add --fix flag to conda doctor with health check fix capabilities. (#15530)
  • Improve error message when conda env export is invoked with an invalid platform. (#15561)

Bug fixes

  • Stop conda run from adding an additional new line after printing to stdout or stderr. (#11763 via [#15539])
  • Non-conda installed Python packages now show up in conda list in free-threading environments. (#14674)
  • Fix Python packages not being listed as from the pypi channel if the site-packages directory includes a symlink. (#14674)
  • Replace deprecated codecs.open() with built-in open() for Python 3.14 compatibility. (#15080)
  • Fix parallel conda command failures on Windows (e.g., start /b) by using GUIDs for unique temp filenames instead of %RANDOM%. (#15169 via [#15598])
  • Sanitize channel config input to remove null values. (#15268 via [#15323])
  • Fix conda list --fields dist_str representation. (#15420)
  • Add the -- separator such that conda run can properly separate executable options from conda options when invoking commands. Now, executable options are correctly parsed and handled. (#15432)
  • Raise an error when no command is provided to conda run, instead of proceeding with an empty command. (#15437)
  • Do not expose __cuda virtual package when no CUDA version was detected. (#15500)
  • Ensure an appropriate error code is returned when conda run is invoked with an invalid environment name or prefix. (#15534)
  • Record size_in_bytes for generated entry points and compiled .pyc files in the prefix manifests. (#15544)
  • Allow conda env update to execute an update on an environment for environment files that do not have conda dependencies. (#15569 via [#15570])
  • Terminate activation early on Windows when activation scripts fail. (#15616)
  • Fix package installation from repodata v3 channels by extracting the correct filename from the URL instead of using the repodata key. This resolves issues when installing packages where the repodata key differs from the actual filename (e.g., wheel packages where the key uses underscores but the filename uses hyphens). (#15620 via [#15626])
  • Fix incorrect source location in deprecation warnings when multiple constants are deprecated in the same module. (#15623 via [#15624])
  • Fix conda clean --tarballs not cleaning up .partial download files. (#15634 via [#15635])
  • Decode SHA256 fields in Python's RECORD metadata files. (#15591)
  • Fix CondaJSONEncoder to support serializing frozendicts. (#15532)
  • Fix argument parser aliases incorrectly defined as a string instead of a tuple. (#15418)
  • Raise an error when attempting to deactivate an environment that is not currently active. (#15609)

Deprecations

  • Mark conda.exception_handler.ExceptionHandler._upload as pending deprecation, to be removed in 27.3. (#13900 via [#14698])
  • Mark conda.exception_handler.ExceptionHandler._ask_upload as pending deprecation, to be removed in 27.3. (#13900 via [#14698])
  • Mark conda.exception_handler.ExceptionHandler._execute_upload as pending deprecation, to be removed in 27.3. (#13900 via [#14698])
  • Mark conda.exception_handler.ExceptionHandler._post_upload as pending deprecation, to be removed in 27.3. (#13900 via [#14698])
  • Mark private helper functions in conda.cli.main_config (_key_exists, _get_key, _set_key, _remove_item, _remove_key, _read_rc, _write_rc, _validate_provided_parameters) as pending deprecation, to be removed in 27.3. Use the new ConfigurationFile class instead. (#15376)
  • Mark conda.models.enums.PathType as pending deprecation, to be removed in 27.3. Use conda.models.enums.PathEnum instead. (#15428)
  • Mark conda.utils.massage_arguments as pending deprecation, to be removed in 27.3. (#15439)
  • Mark conda.gateways.disk.create.extract_tarball as pending deprecation, to be removed in 27.3. Use conda.base.context.context.plugin_manager.extract_package instead. (#15524 via [#15441])
  • Mark the use_system_tmp_path argument of conda.utils.wrap_subprocess_call(use_system_tmp_path=...) as pending deprecation, to be removed in 27.3. Use the TMPDIR, TEMP, or TMP environment variables to set the system temporary directory location. (#15440 via [#15442])
  • Mark private helper functions in conda.common.serializers (_yaml_round_trip, _yaml_safe) as pending deprecation, to be removed in 27.3. Use conda.common.serialize.yaml._yaml() instead. (#15503)
  • Mark conda.common.serializers.yaml_round_trip_load and conda.common.serializers.yaml_safe_load as pending deprecation, to be removed in 27.3. Use conda.common.serialize.yaml.load() instead. (#15503)
  • Mark conda.common.serializers.yaml_round_trip_dump and conda.common.serializers.yaml_safe_dump as pending deprecation, to be removed in 27.3. Use conda.common.serialize.yaml.dump() instead. (#15503)
  • Mark conda.cli.actions.NullCountAction._ensure_value as pending deprecation, to be removed in 27.3. (#15512)
  • Mark conda.exports.input as pending deprecation, to be removed in 27.3. Use builtins.input instead. (#15523 via [#15526])
  • Mark conda.exports.StringIO as pending deprecation, to be removed in 27.3. Use io.StringIO instead. (#15523 via [#15526])
  • Mark conda.exports.PY3 as pending deprecation, to be removed in 27.3. Python 2 is no longer supported. (#15523 via [#15526])
  • Mark conda.exports.string_types as pending deprecation, to be removed in 27.3. Use str instead. (#15523 via [#15526])
  • Mark conda.exports.text_type as pending deprecation, to be removed in 27.3. Use str instead. (#15523 via [#15526])
  • Mark conda.exports.DEFAULT_CHANNELS as pending deprecation, to be removed in 27.3. Use conda.base.constants.DEFAULT_CHANNELS instead. (#15523 via [#15526])
  • Mark conda.exports.DEFAULT_CHANNELS_UNIX as pending deprecation, to be removed in 27.3. Use conda.base.constants.DEFAULT_CHANNELS_UNIX instead. (#15523 via [#15526])
  • Mark conda.exports.DEFAULT_CHANNELS_WIN as pending deprecation, to be removed in 27.3. Use conda.base.constants.DEFAULT_CHANNELS_WIN instead. (#15523 via [#15526])
  • Mark conda.exports.PREFIX_PLACEHOLDER as pending deprecation, to be removed in 27.3. Use conda.base.constants.PREFIX_PLACEHOLDER instead. (#15523 via [#15526])
  • Mark conda.exports._PREFIX_PLACEHOLDER as pending deprecation, to be removed in 27.3. Use conda.base.constants.PREFIX_PLACEHOLDER instead. (#15523 via [#15526])
  • Mark conda.exports.prefix_placeholder as pending deprecation, to be removed in 27.3. Use conda.base.constants.PREFIX_PLACEHOLDER instead. (#15523 via [#15526])
  • Mark conda.exports.CondaError as pending deprecation, to be removed in 27.3. Use conda.CondaError instead. (#15523 via [#15526])
  • Mark conda.exports.CondaHTTPError as pending deprecation, to be removed in 27.3. Use conda.exceptions.CondaHTTPError instead. (#15523 via [#15526])
  • Mark conda.exports.CondaOSError as pending deprecation, to be removed in 27.3. Use conda.exceptions.CondaOSError instead. (#15523 via [#15526])
  • Mark conda.exports.LinkError as pending deprecation, to be removed in 27.3. Use conda.exceptions.LinkError instead. (#15523 via [#15526])
  • Mark conda.exports.LockError as pending deprecation, to be removed in 27.3. Use conda.exceptions.LockError instead. (#15523 via [#15526])
  • Mark conda.exports.PaddingError as pending deprecation, to be removed in 27.3. Use conda.exceptions.PaddingError instead. (#15523 via [#15526])
  • Mark conda.exports.PathNotFoundError as pending deprecation, to be removed in 27.3. Use conda.exceptions.PathNotFoundError instead. (#15523 via [#15526])
  • Mark conda.exports.CondaFileNotFoundError as pending deprecation, to be removed in 27.3. Use conda.exceptions.PathNotFoundError instead. (#15523 via [#15526])
  • Mark conda.exports.UnsatisfiableError as pending deprecation, to be removed in 27.3. Use conda.exceptions.UnsatisfiableError instead. (#15523 via [#15526])
  • Mark conda.base.context.report_errors as pending deprecation, to be removed in 27.3. (#13900 via [#15580])
  • Mark conda.base.constants.ERROR_UPLOAD_URL as pending deprecation, to be removed in 27.3. (#13900 via [#15558])
  • Mark conda.base.context.error_upload_url as pending deprecation, to be removed in 27.3. (#13900 via [#15558])
  • Mark conda.exception_handler.ExceptionHandler.error_upload_url as pending deprecation, to be removed in 27.3. (#13900 via [#15558])
  • Mark conda.common.path.is_package_file as pending deprecation, to be removed in 27.3. Use conda.base.context.context.plugin_manager.has_package_extension instead. (#15629)
  • Mark conda.common.path.KNOWN_EXTENSIONS as pending deprecation, to be removed in 27.3. Use conda.common.path.strip_pkg_extension instead. (#15629)
  • Mark conda.misc.url_pat as pending deprecation, to be removed in 27.3. Use conda.misc._get_url_pattern() instead. (#15629)
  • Mark conda.base.constants.CONDA_PACKAGE_EXTENSIONS as pending deprecation, to be removed in 27.3. Use conda.base.context.context.plugin_manager.get_package_extractors() instead. (#15629)
  • Mark conda.base.constants.CONDA_PACKAGE_PARTS as pending deprecation, to be removed in 27.3. The .part suffix has not been used since 2014; use conda.base.constants.PARTIAL_EXTENSION (.partial) with str.removesuffix() instead. (#15634 via [#15635])

Docs

  • Add documentation for custom_multichannels setting, including its ability to override the defaults multichannel. (#14661)
  • Add documentation for the new conda_package_extractors plugin hook. (#15524 via [#15441])
  • Document how to configure temporary file locations using TMPDIR/TEMP/TMP environment variables. Add comprehensive guide covering container environments, HPC systems, and troubleshooting read-only filesystem errors. (#15440 via [#15442])
  • Add manual development environment setup instructions. (#15482)
  • Add comprehensive guide for using HTTP test server fixture in docs/source/dev-guide/writing-tests/http-test-server.md. Includes usage examples, API reference, and troubleshooting tips. (#15528 via [#15529])
  • Update community support link in getting-started guide. (#15554)
  • Fix duplicated API Guide in documentation. (#15555)
  • Remove setuptools and wheel from add_pip_as_python_dependency configuration description. (#15622)

Other

  • Disable uploading error reports. (#13900 via [#14698])
  • Deprecation warnings now raise errors during testing to better track and address them. (#15525)

Contributors

Full Changelog: https://github.com/conda/conda/compare/25.11.1...26.1.0

Source: README.md, updated 2026-01-30