GPT-5.5 vs GPT-6 Astra
Change modelsGPT-5.5OpenAI
GPT-6 AstraOpenAI
IndexAll categories, out of 100.
69.1 ±2.5
78.0 ±1.9 best
GapIndex points below the top.
−8.9
Top
CoverageIndex weight that has results.
95%
100% best
SpeedOutput tokens per second.
52/s best
34/s
EloLMArena rating and rank.
1466 best
1440
ReleasedMonth of release.
2026-04
2026-09
Input / 1MUS dollars per 1M input tokens.
$5.00 best
$10.00
Output / 1MUS dollars per 1M output tokens.
$30.00 best
$50.00
Batch output / 1MBatch price per 1M output tokens.
$15.00 best
$25.00
1K chats2K tokens in, 500 out, each.
$25.00 best
$45.00
1K documents20K tokens in, 1K out, each.
$130.00 best
$250.00
1K agent tasks200K tokens in, 20K out, each.
$1,600.00 best
$3,000.00
ContextMaximum tokens in one request.
1.05M
1.05M
AgenticMulti-step tasks with tools.
65.8
74.6 best
CodingCode writing and repair.
65.5
76.9 best
ReasoningLogic problems and puzzles.
74.1
83.8 best
MultimodalTasks with images and text.
66.8
71.2 best
KnowledgeFacts and expert knowledge.
70.4
78.5 best
MultilingualTasks in many languages.
—
73.6
InstructionTasks with strict prompt rules.
64.8
79.5 best
MathMath problems.
74.7
78.0 best
Benchmarks
66 sharedOnly GPT-5.5: 46Only GPT-6 Astra: 72
GPT-5.5
GPT-6 Astra