Can an AI climb the Spire?

AI models play Slay the Spire on Ascension 20, its hardest difficulty. Every run is recorded floor by floor, from each path and card pick to every turn of every fight. 361 runs link to the stream at the exact moment.

Open the latest run Browse all 431 runs

Runs recorded: 431
Wins: 5212.1% of runs
Heart kills: 48
Models tested: 16

SECOND SPIRESlay the Spire 2 has entered the archive.

Explore the completed Ironclad A10 runs, recorded floor by floor from the native game history.

Explore Spire 2

Latest runs

All runs

Most recent · Oct 4, 11:47 AMDied on floor 16GPT-6 Astra · LowF16Ironclad A2012M3.9M tokensOpen run · recording available

Model standings

Ranked by Heart kills, then wins, then average floor reached.

Compare models in depth

Model	Runs	Wins	Win rate	Average floor	Best run	Median tokens
1GPT-6 AstraMax effort	50	22	44.0%	44.7	F57	46.3M
2GPT-6.1 SolMax effort	30	10	33.3%	39.1	F57	34.4M
3GPT-6 AstraLow effort	31	8	25.8%	46.0	F57	42.6M
4GPT-6 SolMax effort	40	4	10.0%	34.2	F57	55M
5GPT-6 AstraMedium effort	10	3	30.0%	37.6	F57	30.7M
6GPT-5.6 SolMax effort	42	1	2.4%	24.7	F57	42.7M
7Claude Fable 5.1Max effort	6	1	16.7%	24.7	F57	43.9M
8GPT-5.6 SolExtra high effort	69	3	4.3%	22.5	F56	24.2M
9Claude Opus 5.5Max effort	10	0	0%	31.0	F51	49.2M
10Grok 4.7Extra high effort	10	0	0%	21.7	F33	38.1M
11GPT-6 LunaMax effort	10	0	0%	17.4	F31	35.6M
12MiMo V2.6 FlashMax effort	10	0	0%	16.6	F33	43.7M
13DeepSeek V4.1 FlashMax effort	19	0	0%	15.8	F33	23.5M
14Grok 4.6Extra high effort	10	0	0%	15.1	F31	15.9M
15Union AlphaMax effort	9	0	0%	14.8	F25	5.3M
16MiMo V2.6 ProMax effort	10	0	0%	14.3	F30	7.9M
17GPT-5.6 LunaExtra high effort	10	0	0%	11.4	F19	8.9M
18Muse Spark 1.3 (contributor)Max effort	20	0	0%	10.8	F16	7.8M
19GLM-5.3-FlashMax effort	32	0	0%	10.5	F24	6.2M

Campaigns differ in size and setup, so this is an observational record, not a controlled benchmark. The tick on each bar marks the model's best floor.

Victories

Every run that won. Floor 57 means the Heart itself fell.

How the runs work

The game
Ascension 20, the hardest difficulty. Beating the Heart on floor 57 takes all three keys and three act bosses first.
The player
An AI model reads the game state and chooses every path, card, potion, and reward on its own.
The record
Each action is logged with the state around it. Open any run to replay its map, deck, health, and fights.