Claude Haiku 4.5
VS
Claude Opus 4.8
Claude Haiku 4.5 vs Claude Opus 4.8: which wins at real work?
22 task areas · same graded test runs · rank comparison only, so 0–100 and Elo collections never mix raw scores.
Claude Opus 4.8 wins 19 of 22 task areas we tested; Claude Haiku 4.5 takes 3. Claude Haiku 4.5 costs 5.0× less per token ($6 vs $30 per 1M).
Claude Haiku 4.5 costs 5.0× less per token ($6 vs $30 per 1M).
Task by task
| Task area | Claude Haiku 4.5 | Claude Opus 4.8 | Winner |
|---|---|---|---|
| Chef / Home Cooking |
#113
/ 126
Needs editing
|
#9
/ 126
Strong
|
Claude Opus 4.8 |
| Coding |
#94
/ 115
Usable
|
#3
/ 115
Excellent
|
Claude Opus 4.8 |
| Customer Support |
#99
/ 113
Usable
|
#8
/ 113
Strong
|
Claude Opus 4.8 |
| AI Strategy |
#91
/ 126
Strong
|
#4
/ 126
Strong
|
Claude Opus 4.8 |
| RAG, Safety & Grounding |
#97
/ 113
Strong
|
#11
/ 113
Excellent
|
Claude Opus 4.8 |
| Content & Brand |
#89
/ 124
Usable
|
#8
/ 124
Strong
|
Claude Opus 4.8 |
| Sales |
#80
/ 110
Usable
|
#1
/ 110
Strong
|
Claude Opus 4.8 |
| Knowledge & Docs |
#71
/ 110
Usable
|
#2
/ 110
Excellent
|
Claude Opus 4.8 |
| Creative & Comedy | #84 / 110 | #17 / 110 | Claude Opus 4.8 |
| Executive Assistant |
#73
/ 112
Strong
|
#9
/ 112
Strong
|
Claude Opus 4.8 |
| Presentations & Decks |
#88
/ 110
Strong
|
#32
/ 110
Excellent
|
Claude Opus 4.8 |
| Research & Competitive Analysis |
#59
/ 110
Usable
|
#5
/ 110
Excellent
|
Claude Opus 4.8 |
| Data & Analytics |
#53
/ 110
Excellent
|
#2
/ 110
Excellent
|
Claude Opus 4.8 |
| Structured Output |
#109
/ 113
Usable
|
#61
/ 113
Excellent
|
Claude Opus 4.8 |
| Landing Pages |
#61
/ 72
Usable
|
#18
/ 72
Strong
|
Claude Opus 4.8 |
| Legal & HR |
#48
/ 110
Excellent
|
#5
/ 110
Excellent
|
Claude Opus 4.8 |
| Investor & Pitch |
#63
/ 66
Needs editing
|
#27
/ 66
Strong
|
Claude Opus 4.8 |
| Product & Project Management |
#38
/ 110
Strong
|
#2
/ 110
Excellent
|
Claude Opus 4.8 |
| Training & Education |
#36
/ 110
Excellent
|
#2
/ 110
Excellent
|
Claude Opus 4.8 |
| Frontend & Landing Pages |
#7
/ 109
Usable
|
#21
/ 109
Needs editing
|
Claude Haiku 4.5 |
| Summarization & Meeting Notes |
#27
/ 110
Excellent
|
#35
/ 110
Excellent
|
Claude Haiku 4.5 |
| Translation & Localization |
#27
/ 110
Excellent
|
#35
/ 110
Excellent
|
Claude Haiku 4.5 |
Rank = position among every model config we tested in that task area (lower is better). Sorted by biggest gap first.
Same task, both models — judged
Both models answered the same test case; an independent judge graded each. Quotes are the judge's actual rationale.
Knowledge & Docs
SOP: handle a customer data-deletion request (Cedar & Sage) (Procedure / Runbook)
“The model failed critical safety and structural requirements. The warning for the irreversible deletion was placed at the end of the document rather than before the destructive step. Additionally, the model grouped multiple actions into single steps using bullet points and fabricated a significant amount of company policy, timelines, and system features not provided in the prompt.”
“The model perfectly followed all instructions, including the required prerequisites, roles, numbered steps, and the critical warning before the irreversible deletion. It maintained a generic but highly professional SOP format without fabricating specific UI elements that would violate grounding constraints.”
Frequently asked
Is Claude Haiku 4.5 better than Claude Opus 4.8?
Across 22 task areas we benchmarked, Claude Opus 4.8 ranks higher in 19 and Claude Haiku 4.5 in 3.
Which is cheaper, Claude Haiku 4.5 or Claude Opus 4.8?
Claude Haiku 4.5 costs 5.0× less per token ($6 vs $30 per 1M).
What is Claude Haiku 4.5 better at?
Claude Haiku 4.5 out-ranks Claude Opus 4.8 at Frontend & Landing Pages, Summarization & Meeting Notes, Translation & Localization.
What is Claude Opus 4.8 better at?
Claude Opus 4.8 out-ranks Claude Haiku 4.5 at Chef / Home Cooking, Coding, Customer Support.
More comparisons
This page is Spring Prompt, running in public
We just did this for every model. Do it for your prompt.
The rankings above come from running real tasks through real models and scoring every output. Spring Prompt is that same engine — pointed at your prompt, your test cases, and your definition of good.
- Generate test cases from your prompt — no eval set required to start.
- Compare models side by side with quality, cost and latency in one matrix.
- Optimise the winner until the scores say it's ready to ship.
Prompt × model results
12 test cases · 3 evals