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Claude Haiku 5.5 vs Claude Sonnet 5
Of the 4 public leaderboards that rate both, Claude Haiku 5.5 scores higher on 3 and Claude Sonnet 5 on 1. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, Claude Haiku 5.5 is at 50.2 and Claude Sonnet 5 at 32.4 (out of 100).
Scores as published by each board; table composed October 8, 2026.
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Leaderboard by leaderboard
| Board | Claude Haiku 5.5 | Claude Sonnet 5 | Higher |
|---|---|---|---|
| LMArena Elo (community votes) | 1,586.9 | 1,540.8 | Claude Haiku 5.5 |
| LiveBench global average (0-100) | 72.1 | 76 | Claude Sonnet 5 |
| Vals AI Vals Index accuracy % · weighted finance + coding tasks | 54.3 | 51.8 | Claude Haiku 5.5 |
| Artificial Analysis intelligence index · measured runs only | 43.4 | 38.2 | Claude Haiku 5.5 |
Raw scores are each board's own scale, so compare within a row, not across rows. Full table: the bench index.
For coding
On the ArtificialWatch coding index, Claude Haiku 5.5 is at 73.5 (#11 of 35) and Claude Sonnet 5 at 52.9 (#15). Claude Haiku 5.5 scores higher on 1 of the 2 coding boards that rate both and Claude Sonnet 5 on 1.
| Coding board | Claude Haiku 5.5 | Claude Sonnet 5 |
|---|---|---|
| LiveBench · Coding | 67.5 | 70 |
| Vals Vibe Code Bench | 90.4 | 81.3 |
Claude Haiku 5.5 at a glance
- Developer
- Anthropic
- Status
- Live since October 7, 2026
- API price
- $0.10 input / $0.50 output per 1M tokens · Anthropic, claude-haiku-5-5
- Context window
- 1M tokens
Live — Oct 7 · $0.10/$0.50 per MTok for prompts up to 100K tokens, $0.50/$2.50 above · cache reads $0.01 / $0.05 · 1M ctx / 128K out · knowledge cutoff Jun 2026 · in the API, the Claude apps, AWS, Google Cloud and Microsoft Foundry the same day · Anthropic's own table: OSWorld 2.1 72.4% (GPT-6 Luna 48.9%, Haiku 4.5 15.7%), Terminal-Bench 4.0 39.2% (Luna 16.4%) · Artificial Analysis Intelligence Index 43 at max effort, #2 of 179 in its price tier (read Oct 7) · our sweep fired on claude-haiku-5-5 at 17:52 UTC, OpenRouter listed it at 18:31.
Claude Haiku 5.5 is out at $0.10 / $0.50, a tenth of Haiku 4.5's price
2026-10-07 · Anthropic released Claude Haiku 5.5 on October 7 as claude-haiku-5-5, on the Claude API, Amazon Bedrock, Google Cloud, Microsoft Foundry and in the Claude apps.
Claude Sonnet 5 at a glance
- Developer
- Anthropic
- Status
- Live since June 30, 2026
- API price
- $2 input / $10 output per 1M tokens · Anthropic, claude-sonnet-5
- Context window
- 1M tokens
Shipped Jun 30.
Claude Haiku 5.5 vs Claude Sonnet 5: quick answers
Which is better, Claude Haiku 5.5 or Claude Sonnet 5?
It depends on what you measure. Of the 4 public leaderboards that rate both, Claude Haiku 5.5 scores higher on 3 and Claude Sonnet 5 on 1. Claude Haiku 5.5's widest lead is on Artificial Analysis; Claude Sonnet 5's widest lead is on LiveBench. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, Claude Haiku 5.5 is at 50.2 and Claude Sonnet 5 at 32.4 (out of 100).
Which is newer, Claude Haiku 5.5 or Claude Sonnet 5?
Claude Haiku 5.5. It went live on October 7, 2026, 99 days after Claude Sonnet 5 (June 30, 2026).
Which is cheaper, Claude Haiku 5.5 or Claude Sonnet 5?
Claude Haiku 5.5 is cheaper on both input and output. On each vendor's own API, Claude Haiku 5.5 is $0.10 input / $0.50 output per million tokens and Claude Sonnet 5 is $2 input / $10 output per million tokens. Claude Haiku 5.5's rate rises for prompts over 100K tokens. Prices as published in the models.dev catalog, as of 2026-10-08.
Which has the bigger context window, Claude Haiku 5.5 or Claude Sonnet 5?
Neither. Both take 1M tokens.
How do Claude Haiku 5.5 and Claude Sonnet 5 compare for coding?
On the ArtificialWatch coding index, Claude Haiku 5.5 is at 73.5 (#11 of 35) and Claude Sonnet 5 at 52.9 (#15). Claude Haiku 5.5 scores higher on 1 of the 2 coding boards that rate both and Claude Sonnet 5 on 1.
Who makes Claude Haiku 5.5 and Claude Sonnet 5?
Both are from Anthropic.
Where do these numbers come from?
Each score is the leaderboard's own published figure, read by ArtificialWatch (table composed October 8, 2026). Boards measure different things, so raw scores are only comparable within a row.
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Also: the bench index · API pricing · the wire