GPT-5.5 Pro vs GPT-6.1 Terra
Change modelsGPT-5.5 ProOpenAI
GPT-6.1 TerraOpenAI
IndexAll categories, out of 100.
74.8 ±8.7
77.1 ±3.8 best
GapIndex points below the top.
−2.3 · no clear gap
Top
CoverageIndex weight that has results.
60%
90% best
SpeedOutput tokens per second.
19/s
46/s best
EloLMArena rating and rank.
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ReleasedMonth of release.
2026-04
2026-10
Input / 1MUS dollars per 1M input tokens.
$30.00
$1.00 best
Output / 1MUS dollars per 1M output tokens.
$180.00
$5.00 best
Batch output / 1MBatch price per 1M output tokens.
$90.00
$2.50 best
1K chats2K tokens in, 500 out, each.
$150.00
$4.50 best
1K documents20K tokens in, 1K out, each.
$780.00
$25.00 best
1K agent tasks200K tokens in, 20K out, each.
$9,600.00
$300.00 best
ContextMaximum tokens in one request.
1.05M
1.05M
AgenticMulti-step tasks with tools.
71.1
78.6 best
CodingCode writing and repair.
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74.4
ReasoningLogic problems and puzzles.
81.1
81.3 best
MultimodalTasks with images and text.
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73.2
KnowledgeFacts and expert knowledge.
69.0
70.5 best
MultilingualTasks in many languages.
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—
InstructionTasks with strict prompt rules.
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—
MathMath problems.
76.3
76.9 best
Benchmarks
5 sharedOnly GPT-5.5 Pro: 10Only GPT-6.1 Terra: 45
GPT-5.5 Pro
GPT-6.1 Terra