Compare / Claude Haiku 5.5 vs DeepSeek-V4.1-Flash
Claude Haiku 5.5 vs DeepSeek-V4.1-Flash
Which is cheaper, which is more capable, and which does better at each kind of work, from 37 results on 2 sources that measured both models.
Results as of 8 October 2026 (catalogue release 2026-10-08-4199ce0620fe).
Claude Haiku 5.5 or DeepSeek-V4.1-Flash? The short answer
Pick DeepSeek-V4.1-Flash if quality matters most: it scores higher (Spring Prompt overall 56 against 44). Pick Claude Haiku 5.5 if cost matters more: it costs 5.0 times less per product listing on CatalogBench.
- Spring Prompt overall: Claude Haiku 5.5 44, DeepSeek-V4.1-Flash 56 (out of 100; how the score works).
- Claude Haiku 5.5 is cheaper to run: $0.001 against $0.006 per product listing on CatalogBench (5.0 times less).
- Claude Haiku 5.5 scores higher on the Artificial Analysis Intelligence Index: 43.4 against 39.5.
- Claude Haiku 5.5 is newer: released 7 Oct 2026, against 10 Sep 2026 for DeepSeek-V4.1-Flash.
- On our own benchmarks, on the results both models have: DeepSeek-V4.1-Flash does better for product listings.
- On third-party benchmarks, on the results both models have: Claude Haiku 5.5 does better for agents and tool use and reasoning and knowledge.
At a glance
| Claude Haiku 5.5 | DeepSeek-V4.1-Flash | |
|---|---|---|
| Price per million tokens | $0.10 in · $0.50 out | $0.30 in · $1.20 out |
| Blended (3 in : 1 out) | $0.20 | $0.52 |
| Cheapest host, blended | – | $0.11 (Decart, FP4) |
| Cost per product listing (CatalogBench) | $0.001 | $0.006 |
| Cached input, per million | – | $0.006 cached input |
| Intelligence Index | 43.4 | 39.5 |
| Spring Prompt overall | 44 | 56 |
| Output speed, tokens a second | 235 | 217 |
| Context window | 1,000,000 tokens | 1,048,576 tokens |
| Released | 7 Oct 2026 (newer) | 10 Sep 2026 |
| Weights | Closed | Open |
| Developer based in | the US | China |
Prices are the developer's list price where we have read it, otherwise the typical host on OpenRouter; see every model's price. Intelligence and speed from Artificial Analysis.
Which is better for what
Each model's rank among models available today, for each kind of work, from our own benchmarks and licensed sources. The better rank is in green.
| Use case | Claude Haiku 5.5 | DeepSeek-V4.1-Flash |
|---|---|---|
| Product listingsTurning a sparse product feed and photos into listings that can go live | 11 of 20 | 7 of 20 |
| Decks from an analysisTurning a finished analysis into a deck you could present as it is | 10 of 19 | not measured |
| User surveysPlanning a user survey and reading its results without being misled | 3 of 8 | not measured |
| Marketing planningPlanning a year of ad spend without overspending | 17 of 19 | not measured |
| Agents and tool useMulti-step tasks with tools: support desks, coding agents, function calls | 20 of 164 | 21 of 164 |
| Reasoning and knowledgeHard questions across science, maths and general knowledge | 19 of 198 | 35 of 198 |
| WritingWhat people prefer in blind comparisons, and judged writing quality | not measured | 28 of 188 |
| Sticking to the factsSummarising without inventing things, and factual answers | not measured | 23 of 152 |
| Speed under pressureGood decisions against a real clock (fast chess) | 15 of 22 | not measured |
From our research
Every shared result
Each model's best result on every measure both have, grouped by benchmark, with the setting that produced it. The headline measures of each benchmark come first; the rest are under "Show all". Green marks the better value; where a source reports ranges that overlap, neither is marked.
| Measure | Claude Haiku 5.5 | DeepSeek-V4.1-Flash |
|---|---|---|
| CatalogBench measured by Spring Prompt · 3 results | ||
| Cost per productUS dollars, lower is better | $0.0012 | $0.0061 |
| Reliably publish-ready% of products, higher is better | 26.8% | 41.1% |
| Reliably publish-ready · sales brief% of products, higher is better | 10.7% | 23.2% |
| Artificial Analysis reported by Artificial Analysis · 3 results | ||
| Artificial Analysis Intelligence Indexindex score, higher is better | 43.4max reasoning | 39.5max reasoning |
| Humanity's Last Exam% of questions, higher is better | 44.4%max reasoning | 39.2%max reasoning |
| Terminal-Bench 4.0% of tasks, higher is better | 32.8%max reasoning | 26.8%max reasoning |
Show all 37 results (31 more)
| Measure | Claude Haiku 5.5 | DeepSeek-V4.1-Flash |
|---|---|---|
| CatalogBench measured by Spring Prompt · 27 results | ||
| Channel compliance% of products, higher is better | 100.0% | 99.4% |
| Channel rules broken% of products, lower is better | 0.6% | 3.0% |
| Channel rules broken · sales brief% of products, lower is better | 0.0% | 1.8% |
| Claims to check% of products, lower is better | 0.6% | 0.0% |
| Claims to check · sales brief% of products, lower is better | 1.2% | 0.0% |
| Conflicts caught% of conflicts, higher is better | 100.0% | 100.0% |
| Content quality% of checks, higher is better | 95.6% | 96.7% |
| Content quality · sales brief% of checks, higher is better | 96.3% | 96.2% |
| Decision accuracy% of decisions, higher is better | 95.6% | 96.9% |
| Failed outputs% of products, lower is better | 0.0% | 0.0% |
| Failed outputs · sales brief% of products, lower is better | 0.0% | 0.6% |
| Field accuracy% of missing fields, higher is better | 91.0% | 94.4% |
| Invented values% of filled values, lower is better | 0.8% | 3.1% |
| Missing UK information% of products, lower is better | 0.0% | 0.0% |
| Missing UK information · sales brief% of products, lower is better | 0.0% | 0.0% |
| Not findable% of products, lower is better | 11.9% | 3.6% |
| Not findable · sales brief% of products, lower is better | 10.7% | 3.6% |
| Publish-ready listings% of products, higher is better | 47.0% | 63.7% |
| Publish-ready listings · sales brief% of products, higher is better | 20.2% | 47.0% |
| Unsupported claims% of products, lower is better | 32.1% | 13.1% |
| Unsupported claimsclaims per product, lower is better | 1.20 | 0.54 |
| Unsupported claims · sales brief% of products, lower is better | 70.2% | 39.9% |
| Unsupported claims · sales briefclaims per product, lower is better | 2.46 | 1.25 |
| Wrong attributes% of products, lower is better | 19.6% | 20.2% |
| Wrong attributes · sales brief% of products, lower is better | 18.5% | 20.2% |
| Wrong category or variant% of products, lower is better | 0.0% | 3.0% |
| Wrong category or variant · sales brief% of products, lower is better | 0.0% | 2.4% |
| Artificial Analysis reported by Artificial Analysis · 4 results | ||
| Long-context reasoning (AA-LCR)% of questions, higher is better | 82.7%max reasoning | 84.0%max reasoning |
| Output speedtokens per second, higher is better | 235max reasoning | 217max reasoning |
| SciCode% of problems, higher is better | 55.0%max reasoning | 51.9%max reasoning |
| Time to first answer tokenseconds, lower is better | 5.08low reasoning | 0.85no reasoning |
Quick answers
Is Claude Haiku 5.5 better than DeepSeek-V4.1-Flash?
Pick DeepSeek-V4.1-Flash if quality matters most: it scores higher (Spring Prompt overall 56 against 44). Pick Claude Haiku 5.5 if cost matters more: it costs 5.0 times less per product listing on CatalogBench.
Which is cheaper, Claude Haiku 5.5 or DeepSeek-V4.1-Flash?
Claude Haiku 5.5 is cheaper to run: $0.001 against $0.006 per product listing on CatalogBench (5.0 times less).
Which is faster, Claude Haiku 5.5 or DeepSeek-V4.1-Flash?
Claude Haiku 5.5 writes about 235 tokens a second on its usual API, against 217 for DeepSeek-V4.1-Flash (Artificial Analysis).
Run Claude Haiku 5.5 and DeepSeek-V4.1-Flash on your own prompt
Benchmarks aren't your data. Try both side by side in the playground, with the cost of every answer.