Add GPT-6 Astra Flex model

[chrarnoldus]

Summary

• add the openai/gpt-6-astra-flex exclusive model through OpenRouter, restricted to OpenAI
• add a flex model flag that forces service_tier: flex for Chat Completions, Responses, and Messages requests
• use OpenRouter Flex endpoint pricing only as a fallback when upstream market cost is unavailable

Verification

• formatted changed files with oxfmt
• git diff --check
• tests intentionally left to CI

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Executive Summary

Disabling GPT-6 Astra Flex via status: 'disabled' and updating the registration test is consistent; no remaining issues in this increment.

Files Reviewed (2 files)

• apps/web/src/lib/ai-gateway/models.test.ts
• apps/web/src/lib/ai-gateway/providers/openai-exclusive.ts

Previous Review Summaries (6 snapshots, latest commit 2987508)

Current summary above is authoritative. Previous snapshots are kept for context only.

Previous review (commit 2987508)

Status: No Issues Found | Recommendation: Merge

Executive Summary

Stripping unsupported request-level service_tier on custom-priced and non-Flex exclusive models matches the GPT-6 Astra Flex billing path; no remaining issues in this increment.

Files Reviewed (2 files)

• apps/web/src/lib/ai-gateway/providers/apply-provider-specific-logic.ts
• apps/web/src/lib/ai-gateway/providers/apply-provider-specific-logic.test.ts

Previous review (commit ea08abc)

Status: No Issues Found | Recommendation: Merge

Executive Summary

Converting service_tier to Vercel gateway.serviceTier for flex/priority matches the GPT-6 Astra Flex routing path; no remaining issues in this increment.

Files Reviewed (3 files)

• apps/web/src/lib/ai-gateway/models.test.ts
• apps/web/src/lib/ai-gateway/models.ts
• apps/web/src/lib/ai-gateway/providers/vercel/index.ts

Previous review (commit d43de68)

Status: No Issues Found | Recommendation: Merge

Executive Summary

The GPT-6 Astra Flex registration test now asserts gateway: 'vercel', matching the model definition; no remaining issues in this increment.

Files Reviewed (1 files)

• apps/web/src/lib/ai-gateway/models.test.ts

Previous review (commit 1141f4b)

Status: 1 Issue Found | Recommendation: Address before merge

Executive Summary

Switching GPT-6 Astra Flex to the Vercel gateway leaves the PR's model registration test still asserting gateway: 'openrouter'.

Overview

Severity	Count
CRITICAL	0
WARNING	1
SUGGESTION	0

Issue Details (click to expand)

WARNING

File	Line	Issue
apps/web/src/lib/ai-gateway/providers/openai-exclusive.ts	48	Gateway change is inconsistent with this PR's registration test still asserting openrouter

Files Reviewed (1 files)

• apps/web/src/lib/ai-gateway/providers/openai-exclusive.ts - 1 issue

Fix these issues in Kilo Cloud

Previous review (commit ac330c5)

Status: 1 Issue Found | Recommendation: Address before merge

Executive Summary

Removing the shared service_tier type likely makes assigning 'flex' on the GatewayRequest body union a typecheck failure.

Overview

Severity	Count
CRITICAL	0
WARNING	1
SUGGESTION	0

Issue Details (click to expand)

WARNING

File	Line	Issue
apps/web/src/lib/ai-gateway/providers/kilo-exclusive-model.ts	174	service_tier: 'flex' is not assignable on the GatewayRequest body union after the shared type was removed

Files Reviewed (6 files)

• apps/web/src/lib/ai-gateway/models.test.ts
• apps/web/src/lib/ai-gateway/models.ts
• apps/web/src/lib/ai-gateway/providers/kilo-exclusive-model.test.ts
• apps/web/src/lib/ai-gateway/providers/kilo-exclusive-model.ts - 1 issue
• apps/web/src/lib/ai-gateway/providers/openai-exclusive.ts
• apps/web/src/tests/openrouter-models-config.test.ts

Fix these issues in Kilo Cloud

Previous review (commit 91e7a03)

Status: No Issues Found | Recommendation: Merge

Files Reviewed (7 files)

• apps/web/src/lib/ai-gateway/models.test.ts
• apps/web/src/lib/ai-gateway/models.ts
• apps/web/src/lib/ai-gateway/providers/kilo-exclusive-model.test.ts
• apps/web/src/lib/ai-gateway/providers/kilo-exclusive-model.ts
• apps/web/src/lib/ai-gateway/providers/openai-exclusive.ts
• apps/web/src/lib/ai-gateway/providers/openrouter/types.ts
• apps/web/src/tests/openrouter-models-config.test.ts

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_{Review guidance: REVIEW.md from base branch main}