Inference
EN

GPT-5.5 vs GPT-6.1 Terra

Change models
GPT-5.5OpenAI
GPT-6.1 TerraOpenAI
IndexAll categories, out of 100.
69.1 ±2.5
77.1 ±3.8 best
GapIndex points below the top.
−8.0
Top
CoverageIndex weight that has results.
95% best
90%
SpeedOutput tokens per second.
52/s best
46/s
EloLMArena rating and rank.
1466
—
ReleasedMonth of release.
2026-04
2026-10
Input / 1MUS dollars per 1M input tokens.
$5.00
$1.00 best
Output / 1MUS dollars per 1M output tokens.
$30.00
$5.00 best
Batch output / 1MBatch price per 1M output tokens.
$15.00
$2.50 best
1K chats2K tokens in, 500 out, each.
$25.00
$4.50 best
1K documents20K tokens in, 1K out, each.
$130.00
$25.00 best
1K agent tasks200K tokens in, 20K out, each.
$1,600.00
$300.00 best
ContextMaximum tokens in one request.
1.05M
1.05M
AgenticMulti-step tasks with tools.
65.8
78.6 best
CodingCode writing and repair.
65.5
74.4 best
ReasoningLogic problems and puzzles.
74.1
81.3 best
MultimodalTasks with images and text.
66.8
73.2 best
KnowledgeFacts and expert knowledge.
70.4
70.5 best
MultilingualTasks in many languages.
—
—
InstructionTasks with strict prompt rules.
64.8
—
MathMath problems.
74.7
76.9 best

Benchmarks

29 shared
Only GPT-5.5: 83Only GPT-6.1 Terra: 21
GPT-5.5
GPT-6.1 Terra
Artificial Analysis Humanity's Last ExamKnowledge
45.8%26 / 222
46.2% best24 / 222
Artificial Analysis Long Context ReasoningReasoning
84.3% best7 / 217
82.7%23 / 217
GPQA diamond · Epoch AIKnowledge
94.0%13 / 217
94.3% best10 / 217
Critical Physics TasksReasoning
27.1%17 / 214
28.0% best16 / 214
OTIS Mock AIME 2024-2025Math
100.0%1 / 200
100.0%1 / 200
Artificial Analysis Omniscience AccuracyKnowledge
58.0% best10 / 164
47.6%28 / 164
Vibe Code Bench v1.1Coding
69.8%50 / 123
84.0% best19 / 123
Artificial Analysis SciCodeCoding
55.8% best27 / 114
55.1%28 / 114
Artificial Analysis MMMU-ProMultimodal
79.9%23 / 113
84.7% best6 / 113
SimpleQA VerifiedKnowledge
63.0% best16 / 91
57.3%21 / 91
FrontierMath-Tiers-1-3-v2-PrivateMath
85.3%16 / 90
90.9% best5 / 90
Legal Research BenchLegal
40.4% best35 / 90
26.0%62 / 90
Tax Agent BenchFinance
21.8% best49 / 82
17.1%58 / 82
LiveBench Data AnalysisReasoning
81.6%5 / 80
82.3% best4 / 80
LiveBench ReasoningReasoning
89.7% best15 / 80
88.7%20 / 80
Mystery Game PuzzlesReasoning
56.0%12 / 80
74.0% best4 / 80
FrontierMath-Tier-4-v2-PrivateMath
72.5%16 / 72
92.7% best6 / 72
Massive Multi-discipline Multimodal Understanding ProMultimodal
81.2%10 / 53
85.5% best1 / 53
LiveBench Coding 2.0Coding
85.1%23 / 52
90.8% best11 / 52
LiveBench DesignAgentic
70.3%39 / 52
82.3% best8 / 52