Context Caching does not work with any Gemini Model

[BraveEvidence]

Describe the bug
Context Caching does not work with any Gemini Model gemini-1.5-flash-001 and gemini-2.5-flash-001

To Reproduce
I have below code to read a large text file and then use it as context for a chatbot

import { googleAI } from "@genkit-ai/googleai";
import { genkit } from "genkit";
import fs from "fs/promises";

const ai = genkit({
  plugins: [
    googleAI({
      apiKey: "MY_API_KEY",
    }),
  ],
});

async function main() {
  const textContent = await fs.readFile("./myfile.txt", "utf-8");
  const { text } = await ai.generate({
    messages: [
      {
        role: "user",
        content: [{ text: textContent }], // Include the large text as context
      },
      {
        role: "model",
        content: [
          {
            text: "This analysis is based on the provided text from War and Peace.",
          },
        ],
        metadata: {
          cache: {
            ttlSeconds: 300, // Cache the response to avoid reloading the full text
          },
        },
      },
    ],
    model: googleAI.model("gemini-1.5-flash-001"),
    prompt: "Who is Coding with nobody?.",
  });
  console.log(text);
}

main().catch(console.error);

now i have tried using both gemini-1.5-flash-001 and gemini-2.5-flash-001

when i use gemini-1.5-flash-001 i get error saying

Failed to create cache with key e335a709c48e1e32f5d9c25055b1d955c831d8305c645f8840c99538923f0ee3: Error: [GoogleGenerativeAI Error]: Error fetching from https://generativelanguage.googleapis.com/v1beta/cachedContents: [404 Not Found] models/gemini-1.5-flash-001 is not found for API version v1beta, or is not supported for createCachedContent. Call ListModels to see the list of available models and their supported methods.
GenkitError: INTERNAL: Failed to create cache: Error: [GoogleGenerativeAI Error]: Error fetching from https://generativelanguage.googleapis.com/v1beta/cachedContents: [404 Not Found] models/gemini-1.5-flash-001 is not found for API version v1beta, or is not supported for createCachedContent. Call ListModels to see the list of available models and their supported methods.
    at handleContextCache (/Users/transformhub/Downloads/hub/samples/gen/second/node_modules/@genkit-ai/googleai/src/context-caching/index.ts:77:13)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async handleCacheIfNeeded (/Users/transformhub/Downloads/hub/samples/gen/second/node_modules/@genkit-ai/googleai/src/context-caching/index.ts:118:37)
    at async <anonymous> (/Users/transformhub/Downloads/hub/samples/gen/second/node_modules/@genkit-ai/googleai/src/gemini.ts:1308:9)
    at async <anonymous> (/Users/transformhub/Downloads/hub/samples/gen/second/node_modules/@genkit-ai/core/src/action.ts:531:14)
    at async <anonymous> (/Users/transformhub/Downloads/hub/samples/gen/second/node_modules/@genkit-ai/core/src/action.ts:404:30)
    at async <anonymous> (/Users/transformhub/Downloads/hub/samples/gen/second/node_modules/@genkit-ai/core/src/tracing/instrumentation.ts:73:16)
    at async <anonymous> (/Users/transformhub/Downloads/hub/samples/gen/second/node_modules/@genkit-ai/core/src/tracing/instrumentation.ts:115:24)
    at async runInNewSpan (/Users/transformhub/Downloads/hub/samples/gen/second/node_modules/@genkit-ai/core/src/tracing/instrumentation.ts:103:10)
    at async newTrace (/Users/transformhub/Downloads/hub/samples/gen/second/node_modules/@genkit-ai/core/src/tracing/instrumentation.ts:62:10) {
  source: undefined,
  status: 'INTERNAL',
  detail: undefined,
  code: 500,
  originalMessage: 'Failed to create cache: Error: [GoogleGenerativeAI Error]: Error fetching from https://generativelanguage.googleapis.com/v1beta/cachedContents: [404 Not Found] models/gemini-1.5-flash-001 is not found for API version v1beta, or is not supported for createCachedContent. Call ListModels to see the list of available models and their supported methods.',
  traceId: 'cc38b24c0e7ca3c86f6c335ad391db65',
  ignoreFailedSpan: true
}

when i use gemini-2.5-flash-001 i get error saying

GenkitError: INVALID_ARGUMENT: Model version is required for context caching, supported only in gemini-1.5-flash-001,gemini-1.5-pro-001 models.
    at validateContextCacheRequest (/Users/transformhub/Downloads/hub/samples/gen/second/node_modules/@genkit-ai/googleai/src/context-caching/utils.ts:181:11)
    at handleCacheIfNeeded (/Users/transformhub/Downloads/hub/samples/gen/second/node_modules/@genkit-ai/googleai/src/context-caching/index.ts:113:6)
    at <anonymous> (/Users/transformhub/Downloads/hub/samples/gen/second/node_modules/@genkit-ai/googleai/src/gemini.ts:1308:15)
    at <anonymous> (/Users/transformhub/Downloads/hub/samples/gen/second/node_modules/@genkit-ai/ai/src/model.ts:195:14)
    at <anonymous> (/Users/transformhub/Downloads/hub/samples/gen/second/node_modules/@genkit-ai/core/src/action.ts:531:62)
    at AsyncLocalStorage.run (node:async_hooks:346:14)
    at AsyncStore.run (/Users/transformhub/Downloads/hub/samples/gen/second/node_modules/@genkit-ai/core/src/registry.ts:474:27)
    at runInActionRuntimeContext (/Users/transformhub/Downloads/hub/samples/gen/second/node_modules/@genkit-ai/core/src/action.ts:632:30)
    at <anonymous> (/Users/transformhub/Downloads/hub/samples/gen/second/node_modules/@genkit-ai/core/src/action.ts:531:20)
    at async <anonymous> (/Users/transformhub/Downloads/hub/samples/gen/second/node_modules/@genkit-ai/core/src/action.ts:404:30) {
  source: undefined,
  status: 'INVALID_ARGUMENT',
  detail: undefined,
  code: 400,
  originalMessage: 'Model version is required for context caching, supported only in gemini-1.5-flash-001,gemini-1.5-pro-001 models.',
  traceId: '11a2417965c9d515269830a50301d080',
  ignoreFailedSpan: true
}

the doc says gemini-2.5-flash and gemini-1.5-pro is supported here https://genkit.dev/docs/plugins/google-genai/#how-to-use-context-caching

Expected behavior
Context caching should work with gemini-2.5-flash