Claude Code gateway compatibility guide changedllm-gateway-protocol
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140140`CLAUDE_CODE_DISABLE_EXPERIMENTAL_BETAS=1` stops Claude Code from sending pre-release capabilities and their body fields on every provider, including context management and the beta tool fields. The variable doesn't affect adaptive reasoning, which is selected by model rather than by beta. It never suppresses the OAuth capability that subscription authentication requires.
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142On Claude Code v2.1.227 or later, your organization can keep [MCP tool search](/docs/en/mcp#scale-with-mcp-tool-search) on under this variable through [managed settings](/docs/en/settings#settings-files). What Claude Code sends with that override in place depends on how you connect:
142On Claude Code v2.1.227 or later, your organization can keep [MCP tool search](/docs/en/mcp#scale-with-mcp-tool-search) on under this variable through [managed settings](/docs/en/managed-settings). What Claude Code sends with that override in place depends on how you connect:
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144144* On a direct connection, or through a gateway set with `ANTHROPIC_BASE_URL`, Claude Code keeps sending the tool-search beta header, `defer_loading` tool fields, and `tool_reference` blocks, and strips the rest
145145* On a cloud provider, or signed in through a [Claude apps gateway](/docs/en/claude-apps-gateway), the override has no effect
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187187### Picker entries and caching
188188
189The picker is the interactive model list that opens when a developer runs `/model` in Claude Code. Each discovered entry is labeled "From gateway" and uses `display_name` when provided. The [`availableModels` managed setting](/docs/en/settings#available-settings) bounds what discovery can add.
189The picker is the interactive model list that opens when a developer runs `/model` in Claude Code. Each discovered entry is labeled "From gateway" and uses `display_name` when provided. The [`availableModels` managed setting](/docs/en/settings-reference#availablemodels) bounds what discovery can add.
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191191A discovered ID is skipped when it exactly matches a row already in the picker, or when both the discovered and existing IDs resolve to [Fable](/docs/en/model-config#work-with-fable-5). A discovered explicit ID is also folded into a built-in entry when both resolve to the same model. Built-in rows are keyed on aliases such as `sonnet`, so a discovered explicit ID of the model the alias currently resolves to, such as `claude-sonnet-5`, collapses into the `sonnet` row, while an ID the alias doesn't resolve to, such as `claude-sonnet-4-6`, still adds its own "From gateway" row alongside the built-in entry. Before v2.1.197, Claude Code didn't fold explicit IDs into built-in entries, so a discovered ID such as `claude-sonnet-5` added its own "From gateway" row alongside the `sonnet` row.
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