zed-industries/zed · error

this OpenAI model does not support explicit compaction

Error message

this OpenAI model does not support explicit compaction

What it means

Guard in OpenAiLanguageModel::compact: explicit compaction was requested for a model whose supports_compaction() is false, so the provider refuses before calling the API rather than sending an unsupported compaction request.

Source

Thrown at crates/language_models/src/provider/open_ai.rs:556

        self.model.supports_priority()
    }

    fn supports_server_side_compaction(&self) -> bool {
        self.model.supports_compaction()
    }

    fn supports_explicit_compaction(&self) -> bool {
        self.model.supports_compaction()
    }

    fn compact(
        &self,
        mut request: LanguageModelRequest,
        cx: &AsyncApp,
    ) -> BoxFuture<'static, Result<CompactionResult, LanguageModelCompletionError>> {
        if !self.supports_explicit_compaction() {
            return async {
                Err(LanguageModelCompletionError::Other(anyhow::anyhow!(
                    "this OpenAI model does not support explicit compaction"
                )))
            }
            .boxed();
        }

        normalize_open_ai_response_thinking_effort(&mut request, &self.model);
        let request = match into_open_ai_response(
            request,
            self.model.id(),
            self.model.supports_parallel_tool_calls(),
            self.model.supports_prompt_cache_key(),
            self.max_output_tokens(),
            default_thinking_reasoning_effort(&self.model),
            self.model
                .supported_reasoning_efforts()
                .contains(&open_ai::ReasoningEffort::None),
            &OPEN_AI_PROVIDER_ID,

View on GitHub (pinned to 5a9b9558db)

Solutions

1. Use an OpenAI model that supports server-side compaction
2. Fall back to client-side summarization/context trimming for this model

When it happens

Trigger: Thrown at crates/language_models/src/provider/open_ai.rs:555 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of zed-industries/zed@5a9b9558db (2026-08-20). Data as JSON: /api/errors/4b9fe11e26a5ad14. Report an issue: GitHub.