When was GPT-5.6 Sol released?

GPT-5.6 Sol was released by OpenAI on Friday, Jun 26 2026.

Who made GPT-5.6 Sol?

GPT-5.6 Sol was built by OpenAI. Creators of ChatGPT and the GPT series of models. Pioneered large-scale language model research.

How much does GPT-5.6 Sol cost?

GPT-5.6 Sol costs $5.00 per million input tokens and $30.00 per million output tokens through the OpenAI API. Cached input is $0.50 per million tokens. Those are the rates for the “Up to 272K input tokens” tier; 1 other pricing tier is published for this model. Rates are pay-as-you-go API prices verified against OpenAI's published pricing on August 18, 2026.

What benchmark scores did GPT-5.6 Sol get?

GPT-5.6 Sol reports 19 tracked benchmark scores — CheatBench: 77%; BullshitBench v2: 48%; Gray Swan IPI (k = 1): 3.1%; Gray Swan IPI (k = 10): 16.3%; Gray Swan IPI (k = 15): 20%; ProgramBench: 1%; CursorBench 4.0: 41.7%; DeepSWE 1.1: 73%; Next.js Evals: 77%; Supabase Evals (with skills): 84.1%; Supabase Evals (no skills): 58%; Frontier-Bench v0.1: 34.4%; Terminal-Bench 4.0: 37.27%; Terminal-Bench 2.1: 88.8%; BU Bench: 67%; BrowseComp: 92.2%; ARC-AGI-2: 92.5%; GDPval-AA v2: 1748; threejseval: 1367. Tracked scores may come from lab reports or independent benchmarks; source details accompany the benchmark data. It holds the best score among all models tracked here on BrowseComp.

Is GPT-5.6 Sol open source?

No. GPT-5.6 Sol is a closed model. The weights are not published — it is available only through the provider's own API, apps, or partner platforms.

What came before and after GPT-5.6 Sol?

OpenAI's previous tracked release was GPT-5.5-Cyber on Jun 22 2026, 4 days earlier. It was followed by GPT-5.6 Terra on Jun 26 2026.

GPT-5.6 Sol

Released Jun 26 2026

GPT-5.6 Sol is an AI model released by OpenAI on Friday, Jun 26 2026, 4 days after GPT-5.5-Cyber. Benchmark results (shown below) cover BrowseComp, CheatBench, BullshitBench v2, Gray Swan IPI, ProgramBench, CursorBench 4.0, and 10 more.

API pricing

Up to 272K input tokens

Input: $5.00
Cached input: $0.50
Cache write: $6.25
Output: $30.00

Over 272K input tokens

Input: $10.00
Cached input: $1.00
Cache write: $12.50
Output: $45.00

Reasoning or thinking is supported.

USD per 1M tokensModel mapping

Available from


OpenAI	—	flex	$1.00	$5.00	1M
OpenAI	—	—	$2.00	$10.00	1M
OpenAI	—	fast	$4.00	$20.00	1M
Azure	—	—	$4.00	$20.00	1M
Azure	eu	—	$4.40	$22.00	1M
Azure	us	—	$4.40	$22.00	1M
Amazon Bedrock	us-east-1	—	$4.40	$22.00	1M

USD per 1M tokens

Benchmarks

Coding

ProgramBenchvia ProgramBench

#3 of 20

CursorBench 4.0via CursorBench

41.7%

#6 of 13

DeepSWE 1.1

73%

#6 of 32

Next.js Evals

77%

#12 of 32

Supabase Evals

84.1%with skills

58%no skills

with skills

#5 of 11

no skills

#9 of 11

Terminal & CLI

Frontier-Bench v0.1

34.4%

#2 of 9

Terminal-Bench 4.0via Terminal-Bench

37.27%

#11 of 21

Terminal-Bench 2.1

88.8%

#3 of 32

Agentic & tool use

BrowseCompvia BenchLM

92.2%

BU Bench

67%

#3 of 7

Reasoning & science

ARC-AGI-2via BenchLM

92.5%

#2 of 34

Knowledge work

GDPval-AA v2

1748

#8 of 20

Robustness

CheatBenchvia CheatBench

77%

#10 of 12

BullshitBench v2

48%

#36 of 84

Gray Swan IPI

3.1%k = 1

16.3%k = 10

20%k = 15

k = 1

#7 of 13

k = 10

#6 of 13

k = 15

#7 of 14

Community preference

threejseval

1367

#14 of 18

Source: CursorBench, retrieved 28 September 2026 · Source: CheatBench, retrieved 25 September 2026 · Source: ProgramBench, retrieved 11 September 2026 · Source: Terminal-Bench, retrieved 30 August 2026 · Source: BenchLM, retrieved 24 August 2026. Other sources are identified on the linked benchmark pages.

Compare GPT-5.6 Sol with

GPT-5.6 Sol

Suggested comparisons

GPT-5.6 SolvsGPT-6.1 Sol GPT-5.6 SolvsClaude Sonnet 5.5 GPT-5.6 SolvsGemini 4 Argon GPT-5.6 SolvsMuse Spark 1.3 GPT-5.6 SolvsGrok 4.7 GPT-5.6 SolvsDeepSeek-V4.1-Flash GPT-5.6 SolvsMistral Large 4 GPT-5.6 SolvsKimi K3 GPT-5.6 SolvsGLM-5.3-Flash GPT-5.6 SolvsQwen3.8-Max-0902 GPT-5.6 SolvsNemotron 3.5 Lightning

Frequently asked questions

: GPT-5.6 Sol was released by OpenAI on Friday, Jun 26 2026.
: GPT-5.6 Sol was built by OpenAI. Creators of ChatGPT and the GPT series of models. Pioneered large-scale language model research.
: GPT-5.6 Sol costs $5.00 per million input tokens and $30.00 per million output tokens through the OpenAI API. Cached input is $0.50 per million tokens. Those are the rates for the “Up to 272K input tokens” tier; 1 other pricing tier is published for this model. Rates are pay-as-you-go API prices verified against OpenAI's published pricing on August 18, 2026.
: GPT-5.6 Sol reports 19 tracked benchmark scores — CheatBench: 77%; BullshitBench v2: 48%; Gray Swan IPI (k = 1): 3.1%; Gray Swan IPI (k = 10): 16.3%; Gray Swan IPI (k = 15): 20%; ProgramBench: 1%; CursorBench 4.0: 41.7%; DeepSWE 1.1: 73%; Next.js Evals: 77%; Supabase Evals (with skills): 84.1%; Supabase Evals (no skills): 58%; Frontier-Bench v0.1: 34.4%; Terminal-Bench 4.0: 37.27%; Terminal-Bench 2.1: 88.8%; BU Bench: 67%; BrowseComp: 92.2%; ARC-AGI-2: 92.5%; GDPval-AA v2: 1748; threejseval: 1367. Tracked scores may come from lab reports or independent benchmarks; source details accompany the benchmark data. It holds the best score among all models tracked here on BrowseComp.
: No. GPT-5.6 Sol is a closed model. The weights are not published — it is available only through the provider's own API, apps, or partner platforms.
: OpenAI's previous tracked release was GPT-5.5-Cyber on Jun 22 2026, 4 days earlier. It was followed by GPT-5.6 Terra on Jun 26 2026.