Compare · ModelsLive · 2 picked · head to head
GPT-5.5 Pro vs GPT-6.1 Terra
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
GPT-6.1 Terra wins on 3/5 benchmarks
GPT-6.1 Terra wins 3 of 5 shared benchmarks. Leads in math · knowledge.
Category leads
math·GPT-6.1 Terraknowledge·GPT-6.1 Terra
Hype vs Reality
Attention vs performance
GPT-5.5 Pro
#8 by perf·#9 by attention
GPT-6.1 Terra
#14 by perf·#2 by attention
Best value
GPT-6.1 Terra
33.2x better value than GPT-5.5 Pro
GPT-5.5 Pro
0.7 pts/$
$105.00/M
GPT-6.1 Terra
24.2 pts/$
$3.00/M
Vendor risk
Who is behind the model
OpenAI
$840.0B·Tier 1
OpenAI
$840.0B·Tier 1
Head to head
5 benchmarks · 2 models
GPT-5.5 ProGPT-6.1 Terra
FrontierMath-Tier-4-v2-Private
GPT-6.1 Terra leads by +14.6
GPT-5.5 Pro
78.0
GPT-6.1 Terra
92.7
FrontierMath-Tiers-1-3-v2-Private
GPT-6.1 Terra leads by +3.3
GPT-5.5 Pro
92.3
GPT-6.1 Terra
95.7
GPQA diamond
GPT-6.1 Terra leads by +0.6
Graduate-Level Google-Proof QA (Diamond set) · expert-crafted questions in physics, biology, and chemistry that are difficult even for domain PhDs.
GPT-5.5 Pro
95.7
GPT-6.1 Terra
96.3
OTIS Mock AIME 2024-2025
OTIS Mock AIME 2024-2025 · simulated American Invitational Mathematics Examination problems testing advanced problem-solving skills.
GPT-5.5 Pro
100.0
GPT-6.1 Terra
100.0
SimpleQA Verified
GPT-5.5 Pro leads by +7.2
SimpleQA Verified · short factual questions with verified answers, measuring factual accuracy and the tendency to hallucinate or provide incorrect information.
GPT-5.5 Pro
64.5
GPT-6.1 Terra
57.3
Full benchmark table
| Benchmark | GPT-5.5 Pro | GPT-6.1 Terra |
|---|---|---|
FrontierMath-Tier-4-v2-Private | 78.0 | 92.7 |
FrontierMath-Tiers-1-3-v2-Private | 92.3 | 95.7 |
GPQA diamond Graduate-Level Google-Proof QA (Diamond set) · expert-crafted questions in physics, biology, and chemistry that are difficult even for domain PhDs. | 95.7 | 96.3 |
OTIS Mock AIME 2024-2025 OTIS Mock AIME 2024-2025 · simulated American Invitational Mathematics Examination problems testing advanced problem-solving skills. | 100.0 | 100.0 |
SimpleQA Verified SimpleQA Verified · short factual questions with verified answers, measuring factual accuracy and the tendency to hallucinate or provide incorrect information. | 64.5 | 57.3 |
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| $30.00 | $180.00 | 1.1M tokens (~525 books) | $675.00 | |
| $1.00 | $5.00 | 1.1M tokens (~525 books) | $20.00 |