GPT-5.5 Pro vs GPT-5.6 Terra
Change modelsGPT-5.5 ProOpenAI
GPT-5.6 TerraOpenAI
IndexAll categories, out of 100.
74.8 ±8.7 best
68.9 ±2.0
GapIndex points below the top.
Top
−5.9 · no clear gap
CoverageIndex weight that has results.
60%
100% best
SpeedOutput tokens per second.
19/s
66/s best
EloLMArena rating and rank.
—
1449
ReleasedMonth of release.
2026-04
2026-07
Input / 1MUS dollars per 1M input tokens.
$30.00
$2.00 best
Output / 1MUS dollars per 1M output tokens.
$180.00
$12.00 best
Batch output / 1MBatch price per 1M output tokens.
$90.00
$6.00 best
1K chats2K tokens in, 500 out, each.
$150.00
$10.00 best
1K documents20K tokens in, 1K out, each.
$780.00
$52.00 best
1K agent tasks200K tokens in, 20K out, each.
$9,600.00
$640.00 best
ContextMaximum tokens in one request.
1.05M
1.05M
AgenticMulti-step tasks with tools.
71.1 best
68.2
CodingCode writing and repair.
—
68.4
ReasoningLogic problems and puzzles.
81.1 best
72.5
MultimodalTasks with images and text.
—
67.3
KnowledgeFacts and expert knowledge.
69.0 best
65.5
MultilingualTasks in many languages.
—
60.7
InstructionTasks with strict prompt rules.
—
56.4
MathMath problems.
76.3 best
72.8
Benchmarks
11 sharedOnly GPT-5.5 Pro: 4Only GPT-5.6 Terra: 98
GPT-5.5 Pro
GPT-5.6 Terra