GPT Models
GPT-5.6 Sol / Terra / Luna model selection and comparison, covering o-series reasoning, GPT-Realtime-2.1 voice, and GPT Image 2.
This channel tracks the OpenAI flagship model family — how to pick between the current GPT-5.6 Sol / Terra / Luna tiers by workload, and how to integrate the companion o-series reasoning models, the GPT-Realtime-2.1 voice family, and the GPT Image 2 image family. Every model list and release date stays in sync with the official changelog.
11 article(s) total
What you'll learn in this channel
These are the core topics this channel covers. Each featured article unpacks several of them in depth.
- GPT-5.6 Sol
- GPT-5.6 Terra
- GPT-5.6 Luna
- o-series reasoning
- Responses API selection
- Model migration paths
Daybreak and Cyber model cards are live in the official catalog: Blue/Red aliases deprecated, GPT-5.6 Cyber at 400K
Checked 2026-11-02: the official catalog serves full cards for Daybreak Blue, Daybreak Red, and GPT-5.6 Cyber. Both alias cards are marked Status: Deprecated with no shutdown date; Cyber confirms $12.5/$75, 400K context, Responses-only.
Read articleGPT-6.1 Terra announced and live in GitHub Copilot: the everyday agentic coding tier
Verified 2026-10-27: OpenAI announced Introducing GPT-6.1 Terra on 10-26, and GitHub's changelog shipped it GA in Copilot the same day. Only what loadable sources actually say.
Read articleOpenAI models land on Google Cloud: the Responses API on Vertex AI and the SDK vertex() provider
The 2026-10-21 announcement brings OpenAI frontier models and Codex workflows to Gemini's Model Garden. The same day, openai-python v3.36.0 and openai-node v7.41.0 shipped a vertex() provider so standard clients can call Vertex directly.
Read articleThe GPT-6 family grows: gpt-6-sol, gpt-6-luna, gpt-6.1-sol land in the official SDKs
Verified 2026-10-09: openai-python and openai-node enums both list gpt-6-astra, gpt-6.1-sol, gpt-6-sol, gpt-6-luna; official RSS positions Sol/Luna and GPT-6.1 Sol. Only SDK- and same-day-RSS-verifiable facts are asserted.
Read articleGPT-6-Astra Goes Live: Codex Model Picker and Amazon Bedrock Catalogs
Codex CLI 0.154.0 (2026-09-09) lists GPT-6-Astra first in its model picker and adds it to Amazon Bedrock; a bundled official guide confirms Responses API usage and six reasoning levels topped by ultra. Pricing figures remain unpublished.
Read articlegpt-6-astra appears in the OpenAI SDK: the new ChatModel ID and the Safety Alerts API
openai-python v3.8.0 and openai-node v7.10.0 (2026-09-03) added gpt-6-astra to the ChatModel enum ahead of the GPT-5.6 tiers, plus a Safety Alerts API and misalignment error details. This article only states what SDK source shows.
Read articlereasoning.effort in Practice: Making Reasoning Depth a Tunable Parameter
Same model, adjustable thinking depth. This tutorial covers the reasoning.effort syntax, per-tier scenarios, how it interacts with max_output_tokens and the incomplete status, and the cost consequences of getting it wrong.
Read articleGPT-5.6 vs Claude 4.5 Sonnet vs Gemini 2.5 Pro: 2026-08 production comparison
GPT-5.6 / Claude 4.5 Sonnet / Gemini 2.5 Pro flagship models compared: code / multimodal / long context / long reasoning / tool use / price. Third-party benchmarks + real scenario tests. Multi-model selection decision matrix.
Read articleGPT-5.6 Fine-Tuning in Practice: Cost, Quality, and When to Skip It
GPT-5.6 fine-tuning (SFT / DPO): when it's worth doing and when prompt engineering is cheaper. A decision framework, cost estimate, and three real scenarios.
Read articleGPT-5.6 Model Selection Guide (2026): Sol, Terra, or Luna?
How to pick between GPT-5.6 Sol / Terra / Luna without wasting money or breaking quality: a workload-first framework, the reasoning.effort dial, cost math, and the o-series boundary.
Read articleThe complete guide to GPT models (2026-07): GPT-5.6 Sol, Terra, Luna
OpenAI's current flagship model family is GPT-5.6 (2026-07-09), split into Sol / Terra / Luna. Capability tiers, pricing, context, reasoning effort, and which to pick — plus GPT-Realtime-2.1 voice and GPT Image 2.
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