GPT-5.5 Pro vs GPT-6 Astra
Change modelsGPT-5.5 ProOpenAI
GPT-6 AstraOpenAI
IndexAll categories, out of 100.
74.8 ±8.7
78.0 ±1.9 best
GapIndex points below the top.
−3.2 · no clear gap
Top
CoverageIndex weight that has results.
60%
100% best
SpeedOutput tokens per second.
19/s
34/s best
EloLMArena rating and rank.
—
1440
ReleasedMonth of release.
2026-04
2026-09
Input / 1MUS dollars per 1M input tokens.
$30.00
$10.00 best
Output / 1MUS dollars per 1M output tokens.
$180.00
$50.00 best
Batch output / 1MBatch price per 1M output tokens.
$90.00
$25.00 best
1K chats2K tokens in, 500 out, each.
$150.00
$45.00 best
1K documents20K tokens in, 1K out, each.
$780.00
$250.00 best
1K agent tasks200K tokens in, 20K out, each.
$9,600.00
$3,000.00 best
ContextMaximum tokens in one request.
1.05M
1.05M
AgenticMulti-step tasks with tools.
71.1
74.6 best
CodingCode writing and repair.
—
76.9
ReasoningLogic problems and puzzles.
81.1
83.8 best
MultimodalTasks with images and text.
—
71.2
KnowledgeFacts and expert knowledge.
69.0
78.5 best
MultilingualTasks in many languages.
—
73.6
InstructionTasks with strict prompt rules.
—
79.5
MathMath problems.
76.3
78.0 best
Benchmarks
11 sharedOnly GPT-5.5 Pro: 4Only GPT-6 Astra: 127
GPT-5.5 Pro
GPT-6 Astra