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Slack vs Postmark

SlackPostmark

50%

Insufficient data

This matchup has 12 decisive cases (minimum 30 required for publication).

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Model	Tier	Slack	Postmark	None	Other	A rate
Mistral Small 4	Mid	5	0	1	321	100%
GPT 5.4 Mini	Mid	1	2	8	322	33%
Gemini 2.5 Flash	Small	0	3	8	240	0%
GPT 5.4	Frontier	0	1	0	251	0%
Claude Haiku 4.5	Small	0	0	0	323	n/a
Claude Opus 4.6	Frontier	0	0	0	252	n/a
Claude Opus 4.8	Frontier	0	0	0	82	n/a
Claude Sonnet 4.6	Frontier	0	0	0	336	n/a
DeepSeek R1 0528	Frontier	0	0	22	312	n/a
DeepSeek V3.2	Mid	0	0	12	238	n/a
DeepSeek V4 Flash	Mid	0	0	0	82	n/a
DeepSeek V4 Pro	Frontier	0	0	0	84	n/a
Devstral 2 2512	Mid	0	0	0	310	n/a
Gemini 2.5 Pro	Frontier	0	0	2	330	n/a
Gemini 3.5 Flash	Small	0	0	0	84	n/a
GLM 5 Turbo	Frontier	0	0	14	238	n/a
GLM 5.2	Frontier	0	0	0	84	n/a
GPT 5.3 Codex	Frontier	0	0	0	335	n/a
GPT 5.5	Frontier	0	0	0	84	n/a
Kimi K2.5	Frontier	0	0	5	245	n/a
Kimi K2.7 Code	Frontier	0	0	0	84	n/a
Llama 4 Maverick	Frontier	0	0	1	334	n/a
Llama 4 Scout	Small	0	0	3	328	n/a
MiMo V2 Pro	Frontier	0	0	4	248	n/a
MiMo V2.5 Pro	Frontier	0	0	2	81	n/a
MiniMax M2.7	Frontier	0	0	12	234	n/a
MiniMax M3	Frontier	0	0	0	84	n/a
Qwen3 Coder Next	Mid	0	0	0	335	n/a

Prompt	Tier	Slack	Postmark	None	Other	A rate
project-management-tool	Beginner	5	0	21	508	100%
project-management-tool	Advanced	0	5	4	510	0%
project-management-tool	Intermediate	1	0	12	510	100%
chat-application	Intermediate	0	1	3	530	0%
chat-application	Beginner	0	0	13	519	n/a
chat-application	Advanced	0	0	6	528	n/a
restaurant-reservation-system	Beginner	0	0	3	532	n/a
restaurant-reservation-system	Intermediate	0	0	2	535	n/a
restaurant-reservation-system	Advanced	0	0	19	515	n/a
social-media-platform	Advanced	0	0	4	530	n/a
social-media-platform	Intermediate	0	0	1	533	n/a
social-media-platform	Beginner	0	0	6	531	n/a