Migrate off GPT-5.3-Codex
DeprecatedGPT-5.3-Codex is deprecated and shuts down on 1 Apr 2027. OpenAI's official replacement is GPT-6 Sol. The cheapest comparable model we track is Amazon Nova Lite (Amazon) at $0.105 per 1M tokens blended.
Last verified: 24 Oct 2026 · sourced from official provider documentation
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GPT-5.3-Codex → GPT-6 Sol
Moving to GPT-6 Sol means 1.2× cheaper ($4.81 → $4 /1M blended) and a larger context window (400K → 1.1M).
| Spec | GPT-5.3-Codex | GPT-6 Sol |
|---|---|---|
| Status | Deprecated | GA |
| Blended price /1M | $4.81 | $4 |
| Input / output /1M | $1.75 / $14 | $2 / $10 |
| Context window | 400K | 1.1M |
| Max output | 128.000 | 128.000 |
| Modality | text, image | text, image |
| Knowledge cutoff | 31 Aug 2025 | 20 Apr 2026 |
API string was gpt-5.3-codex → switch to gpt-6-sol. See GPT-6 Sol's full spec sheet →
Budget-friendly replacements for GPT-5.3-Codex
Generally-available models that match GPT-5.3-Codex's capabilities (and at least half its 400K context), ranked by blended price. Every number is computed from official catalog prices.
| Model | Blended /1M | Input / output | Context |
|---|---|---|---|
| Amazon Nova Lite Amazon | $0.105 | $0.06 / $0.24 | 300K |
| Llama 4 Scout (17B-16E Instruct) Meta | $0.15 | $0.1 / $0.3 | 10M |
| Ministral 3 8B Mistral | $0.15 | $0.15 / $0.15 | 256K |
Migrating off GPT-5.3-Codex
What replaces GPT-5.3-Codex?
OpenAI's recommended migration for GPT-5.3-Codex is GPT-6 Sol. The cheapest comparable model in our catalog is Amazon Nova Lite (Amazon) at $0.105/1M blended.
When is GPT-5.3-Codex shut down?
GPT-5.3-Codex is deprecated and scheduled to shut down on 1 Apr 2027 (deprecated 1 Oct 2026). Migrate before that date to avoid a 404.
What is the cheapest alternative to GPT-5.3-Codex?
Amazon Nova Lite (Amazon) is the cheapest generally-available alternative we track that matches GPT-5.3-Codex's capabilities, at $0.06 per 1M input and $0.24 per 1M output tokens ($0.105/1M blended).
Browse the full deprecation watch → or see GPT-5.3-Codex's full spec sheet →
Get a heads-up before your model is retired
New models, price cuts, and deprecations — a short email when something actually changes. No spam, unsubscribe anytime.
The last few changes we caught — this is what lands in your inbox:
- RetiringO4-mini is off - OpenAI shut it down on October 23, 2026, as scheduled; migrate to gpt-5.6-terra
- RetiringO3-mini is off - OpenAI shut it down on October 23, 2026, as scheduled; migrate to gpt-5.6-sol
- RetiringO1-pro is off - OpenAI shut it down on October 23, 2026, as scheduled; migrate to gpt-5.6-sol
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