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DX-3062: list Neon GPT-5.4 and newer under Codex only #258

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Merged
CahidArda merged 1 commit into from
Oct 6, 2026
Merged

DX-3062: list Neon GPT-5.4 and newer under Codex only #258

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9 changes: 9 additions & 0 deletions .changeset/neon-gpt-codex-only.md
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@@ -0,0 +1,9 @@
---
"@upstash/box": patch
"@upstash/box-cli": patch
---

Neon AI Gateway: GPT-5.4 and newer (GPT-6 Astra, GPT-5.6 Sol/Terra/Luna, GPT-5.5,
GPT-5.4/Mini/Nano) are offered for Codex only. Neon refuses tool calls with reasoning
for these models on chat completions, which OpenCode needs; Codex uses the Responses
API. The CLI picker no longer lists them under OpenCode.
15 changes: 15 additions & 0 deletions packages/cli/src/__tests__/models.test.ts
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Expand Up @@ -125,6 +125,21 @@ describe("MODEL_OPTIONS_BY_AGENT", () => {
expect(values(Agent.OpenCode)).toContain(NeonModel.Claude_Haiku_4_5);
expect(values(Agent.OpenCode)).toContain(NeonModel.Claude_Opus_5_5);
expect(values(Agent.Codex).some((v) => v.startsWith("neon/claude-"))).toBe(false);
// GPT-5.4 and newer refuse tools with reasoning on Neon chat completions: Codex only.
for (const model of [
NeonModel.GPT_6_Astra,
NeonModel.GPT_5_6_Sol,
NeonModel.GPT_5_6_Terra,
NeonModel.GPT_5_6_Luna,
NeonModel.GPT_5_5,
NeonModel.GPT_5_4,
NeonModel.GPT_5_4_Mini,
NeonModel.GPT_5_4_Nano,
]) {
expect(values(Agent.Codex)).toContain(model);
expect(values(Agent.OpenCode)).not.toContain(model);
}
expect(values(Agent.OpenCode)).toContain(NeonModel.GPT_5_Nano);
});

it("includes Cursor models", () => {
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12 changes: 3 additions & 9 deletions packages/cli/src/models.ts
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Expand Up @@ -280,17 +280,11 @@ export const MODEL_OPTIONS_BY_AGENT: Record<
],
},
{
// Chat-completions models only: GPT-5.5 Pro and GPT-5.3 Codex are Responses-only on Neon.
// Chat-completions models only. GPT-5.5 Pro and GPT-5.3 Codex are Responses-only on
// Neon, and GPT-5.4 and newer refuse tools with reasoning on chat completions, so
// those run on Codex only.
label: "Neon AI Gateway",
options: [
{ value: NeonModel.GPT_6_Astra, label: "GPT-6 Astra (Neon)" },
{ value: NeonModel.GPT_5_6_Sol, label: "GPT-5.6 Sol (Neon)" },
{ value: NeonModel.GPT_5_6_Terra, label: "GPT-5.6 Terra (Neon)" },
{ value: NeonModel.GPT_5_6_Luna, label: "GPT-5.6 Luna (Neon)" },
{ value: NeonModel.GPT_5_5, label: "GPT-5.5 (Neon)" },
{ value: NeonModel.GPT_5_4, label: "GPT-5.4 (Neon)" },
{ value: NeonModel.GPT_5_4_Mini, label: "GPT-5.4 Mini (Neon)" },
{ value: NeonModel.GPT_5_4_Nano, label: "GPT-5.4 Nano (Neon)" },
{ value: NeonModel.GPT_5_Mini, label: "GPT-5 Mini (Neon)" },
{ value: NeonModel.GPT_5_Nano, label: "GPT-5 Nano (Neon)" },
{ value: NeonModel.GPT_OSS_120B, label: "GPT OSS 120B (Neon)" },
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3 changes: 3 additions & 0 deletions packages/python-sdk/CHANGELOG.md
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Expand Up @@ -4,6 +4,9 @@ All notable changes to `upstash-box` (Python) are documented here.

## Unreleased

- Document that Neon GPT-5.4 and newer (`GPT_6_ASTRA`, `GPT_5_6_*`, `GPT_5_5`,
`GPT_5_4*`) run on Codex only: Neon refuses tool calls with reasoning for them
on chat completions, which OpenCode needs.
- Add `NeonModel` (Neon AI Gateway, `neon/<neon-short-id>`). `infer_default_provider`
routes `neon/gpt-*` to Codex, except `neon/gpt-oss-*`, and every other Neon model
(GPT OSS, Claude, Gemini, Llama, Qwen, Kimi, GLM, Grok) to OpenCode.
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7 changes: 5 additions & 2 deletions packages/python-sdk/upstash_box/types.py
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Expand Up @@ -150,8 +150,11 @@ class NeonModel(str, Enum):

These run on the Codex harness (Responses API) or the OpenCode harness
(chat completions); Box does not run Claude Code with Neon.
``GPT_5_5_PRO`` and ``GPT_5_3_CODEX`` are Responses-only (Codex);
the other GPT models and ``GROK_4_6`` run on both; ``GPT_OSS_*``, the
``GPT_5_5_PRO`` and ``GPT_5_3_CODEX`` are Responses-only (Codex), and
GPT-5.4 and newer (``GPT_6_ASTRA``, ``GPT_5_6_*``, ``GPT_5_5``,
``GPT_5_4*``) run on Codex only, because Neon refuses tool calls with
reasoning for them on chat completions; ``GPT_5_MINI``, ``GPT_5_NANO``
and ``GROK_4_6`` run on both; ``GPT_OSS_*``, the
``CLAUDE_*`` models and every other non-OpenAI model except Grok are served
through chat completions only (OpenCode).
Neon credentials are a token plus a per-branch base URL and must be stored
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6 changes: 4 additions & 2 deletions packages/sdk/src/types.ts
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Expand Up @@ -148,8 +148,10 @@ export enum VercelModel {
*
* These models run on the Codex harness (Responses API) or the OpenCode harness
* (chat completions). Box does not run Claude Code with Neon.
* Codex-only: `GPT_5_5_Pro`, `GPT_5_3_Codex` (Responses-only on Neon).
* Both: the other GPT models and `Grok_4_6` (Neon serves them on both endpoints).
* Codex-only: `GPT_5_5_Pro`, `GPT_5_3_Codex` (Responses-only on Neon), and GPT-5.4 and
* newer (`GPT_6_Astra`, `GPT_5_6_*`, `GPT_5_5`, `GPT_5_4*`): Neon refuses tool calls with
* reasoning for them on chat completions, which OpenCode needs.
* Both: `GPT_5_Mini`, `GPT_5_Nano` and `Grok_4_6`.
* OpenCode-only: `GPT_OSS_120B`, `GPT_OSS_20B`, the Claude models and every other
* non-OpenAI model except Grok (Neon serves them through chat completions only).
* Neon credentials are a token plus a per-branch base URL and must be stored via the
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