diff --git a/.changeset/deep-houses-exist.md b/.changeset/deep-houses-exist.md
new file mode 100644
index 0000000000..ed9dff714a
--- /dev/null
+++ b/.changeset/deep-houses-exist.md
@@ -0,0 +1,5 @@
+---
+"@hey-api/shared": patch
+---
+
+**types**: update project meta types
diff --git a/.changeset/empty-stars-crash.md b/.changeset/empty-stars-crash.md
new file mode 100644
index 0000000000..4338800d23
--- /dev/null
+++ b/.changeset/empty-stars-crash.md
@@ -0,0 +1,5 @@
+---
+"@hey-api/codegen-core": minor
+---
+
+**types**: rename `ProjectRenderMeta` to `ProjectMeta` and key it by language
diff --git a/packages/codegen-core/src/__tests__/exports.test.ts b/packages/codegen-core/src/__tests__/exports.test.ts
index 4c74f76d23..9a6a49849c 100644
--- a/packages/codegen-core/src/__tests__/exports.test.ts
+++ b/packages/codegen-core/src/__tests__/exports.test.ts
@@ -53,7 +53,7 @@ export type _TypeExports = [
   index.NodeScope,
   index.Output,
   index.Project,
-  index.ProjectRenderMeta,
+  index.ProjectMeta,
   index.Ref<any>,
   index.Refs<any>,
   index.RenderContext,
diff --git a/packages/codegen-core/src/__tests__/project.test.ts b/packages/codegen-core/src/__tests__/project.test.ts
index b7dc6c11fc..0ecf91f8dd 100644
--- a/packages/codegen-core/src/__tests__/project.test.ts
+++ b/packages/codegen-core/src/__tests__/project.test.ts
@@ -44,16 +44,12 @@ describe('Project', () => {
 
   it('passes correct ctx to renderer.render()', () => {
     const p = makeProject();
-    p.render({ hello: true });
+    p.render();
 
     const file = [...p.files.registered()][0]!;
     const renderer = file.renderer!;
 
-    expect(renderer.render).toHaveBeenCalledWith({
-      file,
-      meta: { hello: true },
-      project: p,
-    });
+    expect(renderer.render).toHaveBeenCalledWith({ file, project: p });
   });
 });
 
diff --git a/packages/codegen-core/src/extensions.ts b/packages/codegen-core/src/extensions.ts
index 092b1220f9..cb4ee0a157 100644
--- a/packages/codegen-core/src/extensions.ts
+++ b/packages/codegen-core/src/extensions.ts
@@ -1,14 +1,15 @@
+import type { Language } from './languages/types';
+
 /**
- * Arbitrary metadata passed to the project's render function.
+ * Arbitrary project metadata.
  *
  * Implementers should extend this interface for their own needs.
  */
-export interface IProjectRenderMeta {
-  [key: string]: unknown;
-}
+// eslint-disable-next-line @typescript-eslint/no-empty-object-type
+export interface IProjectMeta extends Partial<Record<Language, unknown>> {}
 
 /**
- * Additional metadata about the symbol.
+ * Arbitrary symbol metadata.
  *
  * Implementers should extend this interface for their own needs.
  */
diff --git a/packages/codegen-core/src/index.ts b/packages/codegen-core/src/index.ts
index 0617cc1541..a3dd95bd7a 100644
--- a/packages/codegen-core/src/index.ts
+++ b/packages/codegen-core/src/index.ts
@@ -3,10 +3,7 @@ export { nodeBrand, symbolBrand } from './brands';
 export { detectInteractiveSession } from './config/interactive';
 export { loadConfigFile } from './config/load';
 export { mergeConfigs } from './config/merge';
-export type {
-  IProjectRenderMeta as ProjectRenderMeta,
-  ISymbolMeta as SymbolMeta,
-} from './extensions';
+export type { IProjectMeta as ProjectMeta, ISymbolMeta as SymbolMeta } from './extensions';
 export { File } from './files/file';
 export type { IFileIn as FileIn } from './files/types';
 export { isNode, isNodeRef, isSymbol, isSymbolRef } from './guards';
diff --git a/packages/codegen-core/src/planner/analyzer.ts b/packages/codegen-core/src/planner/analyzer.ts
index aa47fc3764..637554c351 100644
--- a/packages/codegen-core/src/planner/analyzer.ts
+++ b/packages/codegen-core/src/planner/analyzer.ts
@@ -1,3 +1,4 @@
+import type { IProjectMeta } from '../extensions';
 import { isNodeRef, isSymbolRef } from '../guards';
 import type { INode, NodeRelationship } from '../nodes/node';
 import { fromRef, isRef, ref } from '../refs/refs';
@@ -15,12 +16,15 @@ export class AnalysisContext implements IAnalysisContext {
    */
   private _parentStack: Array<INode> = [];
 
+  /** Arbitrary project metadata. */
+  meta: IProjectMeta;
   scope: Scope;
   scopes: Scope = createScope();
   symbol?: Symbol;
 
-  constructor(node: INode) {
+  constructor(node: INode, meta: IProjectMeta) {
     this._parentStack.push(node);
+    this.meta = meta;
     this.scope = this.scopes;
     this.symbol = node.symbol;
   }
@@ -149,14 +153,19 @@ export class AnalysisContext implements IAnalysisContext {
 }
 
 export class Analyzer {
+  private readonly meta: IProjectMeta;
   private nodeCache = new WeakMap<INode, AnalysisContext>();
 
+  constructor(meta: IProjectMeta) {
+    this.meta = meta;
+  }
+
   analyzeNode(node: INode): AnalysisContext {
     const cached = this.nodeCache.get(node);
     if (cached) return cached;
 
     node.root = true;
-    const ctx = new AnalysisContext(node);
+    const ctx = new AnalysisContext(node, this.meta);
     node.analyze(ctx);
 
     this.nodeCache.set(node, ctx);
diff --git a/packages/codegen-core/src/planner/planner.ts b/packages/codegen-core/src/planner/planner.ts
index 90fd062650..854066a65a 100644
--- a/packages/codegen-core/src/planner/planner.ts
+++ b/packages/codegen-core/src/planner/planner.ts
@@ -1,7 +1,6 @@
 import path from 'node:path';
 
 import type { ExportModule, ImportModule } from '../bindings';
-import type { IProjectRenderMeta } from '../extensions';
 import type { File } from '../files/file';
 import type { INode } from '../nodes/node';
 import { canDeclarationsShareIdentifier } from '../project/namespace';
@@ -18,22 +17,23 @@ import { createScope, registerName } from './scope';
 const isTypeOnlyKind = (kind: SymbolKind) => kind === 'type' || kind === 'interface';
 
 export class Planner {
-  private readonly analyzer = new Analyzer();
+  private readonly analyzer: Analyzer;
   private readonly cacheResolvedNames = new Set<number>();
   private readonly project: IProject;
 
   constructor(project: IProject) {
+    this.analyzer = new Analyzer(project.meta);
     this.project = project;
   }
 
   /**
    * Executes the planning phase for the project.
    */
-  plan(meta?: IProjectRenderMeta) {
+  plan() {
     this.cacheResolvedNames.clear();
     this.allocateFiles();
     this.assignLocalNames();
-    this.resolveFilePaths(meta);
+    this.resolveFilePaths();
     this.planExports();
     this.planImports();
   }
@@ -112,7 +112,7 @@ export class Planner {
    *
    * Resolves final paths relative to the project's root directory.
    */
-  private resolveFilePaths(meta?: IProjectRenderMeta): void {
+  private resolveFilePaths(): void {
     for (const file of this.project.files.registered()) {
       if (file.external) {
         file.setFinalPath(file.logicalFilePath);
@@ -124,7 +124,7 @@ export class Planner {
       if (finalPath) {
         file.setFinalPath(path.resolve(this.project.root, finalPath));
       }
-      const ctx: RenderContext = { file, meta, project: this.project };
+      const ctx: RenderContext = { file, project: this.project };
       const renderer = this.project.renderers.find((r) => r.supports(ctx));
       if (renderer) file.setRenderer(renderer);
     }
diff --git a/packages/codegen-core/src/planner/types.ts b/packages/codegen-core/src/planner/types.ts
index 94e75a3c33..1d0b2452c9 100644
--- a/packages/codegen-core/src/planner/types.ts
+++ b/packages/codegen-core/src/planner/types.ts
@@ -1,3 +1,4 @@
+import type { IProjectMeta } from '../extensions';
 import type { Ref } from '../refs/types';
 import type { Symbol } from '../symbols/symbol';
 import type { NameScopes, Scope } from './scope';
@@ -20,6 +21,8 @@ export interface IAnalysisContext {
   injectChildren(input: Input): void;
   /** Get local names in the current scope. */
   localNames(scope: Scope): NameScopes;
+  /** Arbitrary project metadata. */
+  meta: IProjectMeta;
   /** Pop the current local scope. */
   popScope(): void;
   /** Push a new local scope. */
diff --git a/packages/codegen-core/src/project/project.ts b/packages/codegen-core/src/project/project.ts
index 1ff95558e4..07b8d74b23 100644
--- a/packages/codegen-core/src/project/project.ts
+++ b/packages/codegen-core/src/project/project.ts
@@ -1,6 +1,6 @@
 import path from 'node:path';
 
-import type { IProjectRenderMeta } from '../extensions';
+import type { IProjectMeta } from '../extensions';
 import { FileRegistry } from '../files/registry';
 import { defaultExtensions } from '../languages/extensions';
 import { defaultModuleEntryNames } from '../languages/modules';
@@ -19,6 +19,7 @@ export class Project implements IProject {
   private _isPlanned = false;
 
   readonly files: FileRegistry;
+  readonly meta: IProjectMeta;
   readonly nodes = new NodeRegistry();
   readonly symbols = new SymbolRegistry();
 
@@ -42,8 +43,9 @@ export class Project implements IProject {
       | 'nameConflictResolvers'
       | 'renderers'
     > &
-      Pick<IProject, 'root'>,
+      Pick<IProject, 'root'> & { meta?: IProjectMeta },
   ) {
+    this.meta = args.meta ?? {};
     const fileName = args.fileName;
     this.defaultFileName = args.defaultFileName ?? 'main';
     this.defaultNameConflictResolver =
@@ -66,18 +68,18 @@ export class Project implements IProject {
     this.root = path.resolve(args.root).replace(/[/\\]+$/, '');
   }
 
-  plan(meta?: IProjectRenderMeta): void {
+  plan(): void {
     if (this._isPlanned) return;
-    new Planner(this).plan(meta);
+    new Planner(this).plan();
     this._isPlanned = true;
   }
 
-  render(meta?: IProjectRenderMeta): ReadonlyArray<IOutput> {
-    if (!this._isPlanned) this.plan(meta);
+  render(): ReadonlyArray<IOutput> {
+    if (!this._isPlanned) this.plan();
     const files: Array<IOutput> = [];
     for (const file of this.files.registered()) {
       if (!file.external && file.finalPath && file.renderer) {
-        const content = file.renderer.render({ file, meta, project: this });
+        const content = file.renderer.render({ file, project: this });
         files.push({ content, path: file.finalPath });
       }
     }
diff --git a/packages/codegen-core/src/project/types.ts b/packages/codegen-core/src/project/types.ts
index e3a1863af0..ee5604cd51 100644
--- a/packages/codegen-core/src/project/types.ts
+++ b/packages/codegen-core/src/project/types.ts
@@ -1,4 +1,4 @@
-import type { IProjectRenderMeta } from '../extensions';
+import type { IProjectMeta } from '../extensions';
 import type { IFileRegistry } from '../files/types';
 import type { Extensions, ModuleEntryNames, NameConflictResolvers } from '../languages/types';
 import type { INodeRegistry } from '../nodes/types';
@@ -42,6 +42,8 @@ export interface IProject {
   readonly fileName?: (name: string) => string;
   /** Centralized file registry for the project. */
   readonly files: IFileRegistry;
+  /** Arbitrary project metadata. */
+  readonly meta: IProjectMeta;
   /**
    * Map of module entry names for each language.
    *
@@ -74,7 +76,7 @@ export interface IProject {
    * @param meta Arbitrary metadata.
    * @returns void
    */
-  plan(meta?: IProjectRenderMeta): void;
+  plan(meta?: IProjectMeta): void;
   /**
    * Produces output representations for all files in the project.
    *
@@ -83,7 +85,7 @@ export interface IProject {
    * @example
    * project.render().forEach(output => writeFile(output));
    */
-  render(meta?: IProjectRenderMeta): ReadonlyArray<IOutput>;
+  render(meta?: IProjectMeta): ReadonlyArray<IOutput>;
   /**
    * List of available renderers.
    *
diff --git a/packages/codegen-core/src/renderer.ts b/packages/codegen-core/src/renderer.ts
index ceee414c04..718e5c2f54 100644
--- a/packages/codegen-core/src/renderer.ts
+++ b/packages/codegen-core/src/renderer.ts
@@ -1,4 +1,3 @@
-import type { IProjectRenderMeta } from './extensions';
 import type { File } from './files/file';
 import type { INode } from './nodes/node';
 import type { IProject } from './project/types';
@@ -8,10 +7,6 @@ export interface RenderContext<Node extends INode = INode> {
    * The current file.
    */
   file: File<Node>;
-  /**
-   * Arbitrary metadata.
-   */
-  meta?: IProjectRenderMeta;
   /**
    * The project the file belongs to.
    */
diff --git a/packages/openapi-python/src/createClient.ts b/packages/openapi-python/src/createClient.ts
index 213a0cb385..5d5777b508 100644
--- a/packages/openapi-python/src/createClient.ts
+++ b/packages/openapi-python/src/createClient.ts
@@ -138,6 +138,11 @@ export async function createClient({
         }
         return name === '__init__' || name.endsWith(suffix) ? name : `${name}${suffix}`;
       },
+      meta: {
+        python: {
+          version: config.output.pythonVersion,
+        },
+      },
       nameConflictResolvers: config.output.nameConflictResolver
         ? {
             python: config.output.nameConflictResolver,
diff --git a/packages/openapi-python/src/index.ts b/packages/openapi-python/src/index.ts
index 10e4317e9b..6e05de4583 100644
--- a/packages/openapi-python/src/index.ts
+++ b/packages/openapi-python/src/index.ts
@@ -5,15 +5,10 @@ import '@hey-api/codegen-core';
 import '@hey-api/shared';
 
 declare module '@hey-api/codegen-core' {
-  interface ProjectRenderMeta {
-    /**
-     * If specified, this will be the file extension used when importing
-     * other modules. By default, we don't add a file extension and let the
-     * runtime resolve it.
-     *
-     * @default null
-     */
-    importFileExtension?: AnyString | null;
+  interface ProjectMeta {
+    python?: {
+      version: PythonVersion;
+    };
   }
 
   interface SymbolMeta {
@@ -61,6 +56,7 @@ import colors from 'ansi-colors';
 // @ts-expect-error
 import colorSupport from 'color-support';
 
+import type { PythonVersion } from './config/output/types';
 import type { UserConfig } from './config/types';
 import type { HeyApiClientHttpxPlugin } from './plugins/@hey-api/client-httpx';
 import type { HeyApiSdkPlugin } from './plugins/@hey-api/sdk';
diff --git a/packages/openapi-ts/src/index.ts b/packages/openapi-ts/src/index.ts
index 951e395741..358407079a 100644
--- a/packages/openapi-ts/src/index.ts
+++ b/packages/openapi-ts/src/index.ts
@@ -5,7 +5,7 @@ import '@hey-api/codegen-core';
 import '@hey-api/shared';
 
 declare module '@hey-api/codegen-core' {
-  interface ProjectRenderMeta {
+  interface ProjectMeta {
     /**
      * If specified, this will be the file extension used when importing
      * other modules. By default, we don't add a file extension and let the
diff --git a/packages/shared/src/config/output/types.ts b/packages/shared/src/config/output/types.ts
index 5576d2f046..6c6beb4345 100644
--- a/packages/shared/src/config/output/types.ts
+++ b/packages/shared/src/config/output/types.ts
@@ -3,7 +3,7 @@ import type { MaybeArray, MaybeFunc } from '@hey-api/types';
 
 export type OutputHeader = MaybeFunc<
   (
-    ctx: Pick<RenderContext, 'meta' | 'project'> &
+    ctx: Pick<RenderContext, 'project'> &
       Pick<Partial<RenderContext>, 'file'> & {
         /** The default header value. */
         defaultValue: ReadonlyArray<string>;