Staying with OpenAI still leaves a decision: GPT-6.1 Terra (Max) or GPT-6 Luna (Max). GPT-6.1 Terra Max leads the intelligence index 51.3 to 27.9, a gap of 23.4 points. Everything below is read from the benchmark, price and speed data in Franklin AI's catalogue; nothing here comes from a hands-on test.
How the intelligence index compares
On the intelligence index, GPT-6.1 Terra Max scores 51.3 against 27.9 for GPT-6 Luna Max. A gap this large suggests the two are built for different jobs.
Across the 109 active models with an intelligence score in the catalogue, GPT-6.1 Terra Max ranks 14th and GPT-6 Luna Max ranks 62nd.
For coding or maths work specifically, the catalogue has no dedicated index on either side yet.
Throughput and time to first token
Once a response is under way, GPT-6.1 Terra Max produces roughly 114 tokens per second against 121 tokens per second for GPT-6 Luna Max. There is little to choose between them on raw output speed. The wait for the first token averages 6.2 minutes on GPT-6.1 Terra Max against 2.0 minutes on GPT-6 Luna Max. GPT-6.1 Terra Max waits 3 times as long before its first token. Waits that long are felt on every chat-style request, though they matter less for batch jobs.
Add the two numbers up for a 2,000-token reply and GPT-6 Luna Max finishes first: 6.5 minutes for GPT-6.1 Terra Max, 2.3 minutes for GPT-6 Luna Max.
Running costs
GPT-6.1 Terra Max lists $1.00 per million input tokens and $5.00 per million output tokens; GPT-6 Luna Max lists $0.10 and $0.50. That makes GPT-6 Luna Max's output 90% cheaper.
A reference job of 1 million input tokens and 200,000 output tokens costs $2.00 with GPT-6.1 Terra Max and $0.20 with GPT-6 Luna Max, so GPT-6 Luna Max saves $1.80. For a chat app with 50,000 sessions of 800 input and 300 output tokens, GPT-6 Luna Max would come in 90% lower: $115 for GPT-6.1 Terra Max against $11.50 for GPT-6 Luna Max. Blended at three input tokens per output token, the effective rates are $2.00 for GPT-6.1 Terra Max and $0.20 for GPT-6 Luna Max.
Is the price in proportion?
A blunt value measure, blended price over intelligence score, puts GPT-6.1 Terra Max at $0.039 and GPT-6 Luna Max at $0.0072 per point. GPT-6 Luna Max delivers each index point for 82% less; whether GPT-6.1 Terra Max's extra 23.4 points are worth the premium depends on how often your tasks need them.
Generation gap
GPT-6.1 Terra Max arrived on October 26, 2026, 34 days after GPT-6 Luna Max (September 22, 2026). They are effectively contemporaries.

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