Model context window is not respected

[mrcfps]

Describe the bug

The input tokens exceed the model context window size, causing execution errors.

Full error stack: Error: 400 This endpoint's maximum context length is 32768 tokens. However, you requested about 42832 tokens (42832 of text input). Please reduce the length of either one, or use the "middle-out" transform to compress your prompt automatically.
    at APIError.generate (/app/node_modules/.pnpm/openai@4.104.0_encoding@0.1.13_ws@8.18.3_zod@3.23.8/node_modules/openai/error.js:45:20)
    at OpenAI.makeStatusError (/app/node_modules/.pnpm/openai@4.104.0_encoding@0.1.13_ws@8.18.3_zod@3.23.8/node_modules/openai/core.js:302:33)
    at OpenAI.makeRequest (/app/node_modules/.pnpm/openai@4.104.0_encoding@0.1.13_ws@8.18.3_zod@3.23.8/node_modules/openai/core.js:346:30)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async /app/node_modules/.pnpm/@langchain+openai@0.5.6_@langchain+core@0.3.29_openai@4.104.0_encoding@0.1.13_ws@8.18.3_zod@3_stakin3q32wwqgut65iyrtr74e/node_modules/@langchain/openai/dist/chat_models.cjs:2038:29
    at async RetryOperation._fn (/app/node_modules/.pnpm/p-retry@4.6.2/node_modules/p-retry/index.js:50:12)

To Reproduce
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Expected behavior
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Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context
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