[Workers AI] Clarify OpenAI Chat Completions vs Responses API support

[KastanDay]

Note: I'm a recent Cloudflare hire on the Workers AI team 👋 ☁️🧡

Summary

Update slightly misleading docs; clarify that Workers AI is 99% Chat Completions, with the exception of GPT-OSS[20b,120b] that are the only ones that support the Responses API, and only non-streaming.

• clarify that most Workers AI text generation models use the Chat Completions endpoint
• document non-streaming Responses API support for GPT-OSS 120B and 20B

Validation

• astro check (0 errors)
• Prettier check for both modified MDX files
• local page preview

[cloudflare-docs-bot]

Review

💡 3 suggestions found in commit 7216490.

Fix in your agent

Fix the following review findings in PR #32116 (https://github.com/cloudflare/cloudflare-docs/pull/32116).

Before making changes, review each finding and present a brief summary table:
- For each finding, state whether you agree, disagree, or need clarification
- If you disagree (e.g. the fix requires disproportionate effort for minimal benefit,
  or the finding is factually incorrect), explain why
- If you need clarification before deciding, ask those questions
- Then share your plan for which issues to tackle and in what order

After triaging, fix all legitimate findings. For any you decide to skip,
post a comment on this PR with the finding ID and your reasoning.

---

## Style Guide Review

### Suggestions (3)

#### SG-8f6e0ca937ed · Passive voice
- **File:** `src/content/partials/workers-ai/openai-compatibility.mdx` line 5
- **Issue:** The Responses API (`/v1/responses`) is available only for GPT-OSS models
- **Fix:** Rewrite in active voice: Only GPT-OSS models support the Responses API (`/v1/responses`)

#### SG-f68833f0df2b · Avoid passive voice
- **File:** `src/content/docs/workers-ai/configuration/open-ai-compatibility.mdx` line 62
- **Issue:** Line uses passive voice (`is supported only by...`, `is supported`).
- **Fix:** Rewrite in active voice, e.g., `Only the ... models support the Responses API. Responses requests must be non-streaming; use stream: false.`

#### SG-dd357934728e · Use TypeScriptExample component for JavaScript examples
- **File:** `src/content/docs/workers-ai/configuration/open-ai-compatibility.mdx` line 64
- **Issue:** Raw ` ```js ` fenced block used for a code example in a docs MDX file.
- **Fix:** Replace the ` ```js ` block with the `<TypeScriptExample>` component.

Code Review

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_{No code review issues found.}

Conventions

_{No convention issues found.}

Style Guide Review

Suggestions (3)

File	Issue
partials/workers-ai/openai-compatibility.mdx line 5	Passive voice — The Responses API (/v1/responses) is available only for GPT-OSS models Fix: Rewrite in active voice: Only GPT-OSS models support the Responses API (/v1/responses)
workers-ai/configuration/open-ai-compatibility.mdx line 62	Avoid passive voice — Line uses passive voice (is supported only by..., is supported). Fix: Rewrite in active voice, e.g., Only the ... models support the Responses API. Responses requests must be non-streaming; use stream: false.
workers-ai/configuration/open-ai-compatibility.mdx line 64	Use TypeScriptExample component for JavaScript examples — Raw ```js fenced block used for a code example in a docs MDX file. Fix: Replace the ```js block with the <TypeScriptExample> component.

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[KastanDay]

Looks ready to merge from my POV. Thanks team.