VeitB
1
OpenAI tasked GPT-5.6 with optimizing its own runtime efficiency.
The results:
- 20% lower serving costs through production GPU kernel improvements.
- More than 15% better token-generation efficiency through improved speculative decoding.
These improvements are being passed on to everyone using the API, Codex, and ChatGPT.
Starting today, GPT-5.6 Luna, the fastest and most affordable model, will cost 80% less. GPT-5.6 Terra, the balanced model for everyday work, will cost 20% less.
Along the price reductions for GPT-5.6 Luna and Terra, Fast mode for GPT-5.6 Sol in the API delivers up to 2.5x the speed of Standard processing at twice the Standard price. It gives API customers faster access to GPT-5.6 Sol without changing the model’s intelligence.
OpenAI is also upgrading Auto-review in the ChatGPT app and Codex CLI from GPT-5.4 to GPT-5.6 Luna. Combined with Luna’s new pricing, Auto-review is expected to cost about 10x less. This affects auto-approve mode (“review for me” in the app), which now uses Luna to prevent many high risk actions from the main agent
nice, with the new prices gpt-5.6-luna beats gpt-5.4-mini in pricing and consolidates as the best option for cheaper runs.
_j
4
Note: fast on API == "service_tier": "priority"
GPT-5.6 API pricing changes
Prices are in USD per 1 million tokens.
| Model |
Input — Old |
Input — New |
Cached — Old |
Cached — New |
Output — Old |
Output — New |
| GPT-5.6 Sol |
$5.00 |
$5.00 |
$0.50 |
$0.50 |
$30.00 |
$30.00 |
| GPT-5.6 Terra |
$2.50 |
$2.00 |
$0.25 |
$0.20 |
$15.00 |
$12.00 |
| GPT-5.6 Luna |
$1.00 |
$0.20 |
$0.10 |
$0.02 |
$6.00 |
$1.20 |
Image cost report
by API calls just done
Vision: not hit with a humongous token cost multiplier on Luna (yet?) for input images as with other mini or nano models - just an unpublished-anywhere multiplication factor: 120% the cost for image tokens, across all gpt-5.6 models, that you’d arrive at after otherwise following the vision documentation exactly.
note: Up to 1500 individual image inputs per request
Updated (with model cost truth table in code): OpenAI Vision Token Calculator
I find the drop in Luna’s price particularly interesting because I found Luna to be an excellent informal chat buddy and spelling assistant! 
Translated by AI:
Give us a reset on the credits, haha.
Da um resete ai nos créditos pra gente kkk.
