GPT-5.5 vs GPT-5.6 Terra
Change modelsGPT-5.5OpenAI
GPT-5.6 TerraOpenAI
IndexAll categories, out of 100.
69.1 ±2.5 best
68.9 ±2.0
GapIndex points below the top.
Top
−0.2 · no clear gap
CoverageIndex weight that has results.
95%
100% best
SpeedOutput tokens per second.
52/s
66/s best
EloLMArena rating and rank.
1466 best
1449
ReleasedMonth of release.
2026-04
2026-07
Input / 1MUS dollars per 1M input tokens.
$5.00
$2.00 best
Output / 1MUS dollars per 1M output tokens.
$30.00
$12.00 best
Batch output / 1MBatch price per 1M output tokens.
$15.00
$6.00 best
1K chats2K tokens in, 500 out, each.
$25.00
$10.00 best
1K documents20K tokens in, 1K out, each.
$130.00
$52.00 best
1K agent tasks200K tokens in, 20K out, each.
$1,600.00
$640.00 best
ContextMaximum tokens in one request.
1.05M
1.05M
AgenticMulti-step tasks with tools.
65.8
68.2 best
CodingCode writing and repair.
65.5
68.4 best
ReasoningLogic problems and puzzles.
74.1 best
72.5
MultimodalTasks with images and text.
66.8
67.3 best
KnowledgeFacts and expert knowledge.
70.4 best
65.5
MultilingualTasks in many languages.
—
60.7
InstructionTasks with strict prompt rules.
64.8 best
56.4
MathMath problems.
74.7 best
72.8
Benchmarks
78 sharedOnly GPT-5.5: 34Only GPT-5.6 Terra: 31
GPT-5.5
GPT-5.6 Terra