Openai · Subscription ✓ verified recently
ChatGPT Plus ($20/mo, Codex included) + OpenAI API GPT-5.6 family
confidence: high
Verdict
ChatGPT Plus $20/mo now includes Codex (web/CLI/IDE/iOS) with GPT-5.6 Sol/Terra/Luna access (~10-100 Sol / 25-200 Terra / 250-2,000 Luna local messages per 5h window); API stays pay-as-you-go at Luna $0.20/$1.20, Terra $2/$12, Sol $4/$20 per 1M in/out with Sol promo locked through Nov 21, 2026.
The terms
- $20.00/month
- ChatGPT Plus at $20/month includes Codex on web, CLI, IDE extension, and iOS plus the GPT-5.6 family (Sol/Terra/Luna) and ChatGPT credits; per five-hour window Plus gets roughly 10-100 Sol, 25-200 Terra, or 250-2,000 Luna local messages (weekly limits may apply); API is separate pay-as-you-go.
From the official page
"gpt-5.6-sol $4.00 $0.40 $5.00 $20.00 $8.00 $0.80 $10.00 $30.00 gpt-5.6-terra $2.00 $0.20 $2.50 $12.00 $4.00 $0.40 $5.00 $18.00 gpt-5.6-luna $0.20 $0.02 $0.25 $1.20 $0.40 $0.04 $0.50 $1.80"
"Our latest models Prices per 1M tokens."
"GPT-5.6 Sol’s promotional pricing is available at least through November 21, 2026."
"$20 /month Get Plus"
"ChatGPT Work and Codex are included in your ChatGPT Free, Go, Plus, Pro, Business, Edu, or Enterprise plan"
"Model Plus Pro 5x Pro 20x Business API Key GPT-5.6 Sol 10-100 50-500 200-2,000 10-100 Usage-based GPT-5.6 Terra 25-200 125-1,000 500-4,000 25-200 Usage-based GPT-5.6 Luna 250-2,000 1,250-10,000 5,000-40,000 250-2,000 Usage-based"
"1,050,000 context window 128,000 max output tokens"
"Modalities Text Input and output Image Input only Audio Not supported Video Not supported"
Verified 2026-08-26
The math
Free within provider limits — effective marginal cost is $0 until quotas are hit.
Watch out
Machine-discovered entry — numbers trace to official sources via quotes; editorial verdict pending.