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Claude Haiku 5.5 vs Gemini 3.8 Flash
Of the 4 public leaderboards that rate both, Claude Haiku 5.5 scores higher on 2 and Gemini 3.8 Flash on 2. 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 Gemini 3.8 Flash at 47.1 (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 | Gemini 3.8 Flash | Higher |
|---|---|---|---|
| LMArena Elo (community votes) | 1,586.9 | 1,583.5 | Claude Haiku 5.5 |
| LiveBench global average (0-100) | 72.1 | 75.8 | Gemini 3.8 Flash |
| Vals AI Vals Index accuracy % · weighted finance + coding tasks | 54.3 | 54.8 | Gemini 3.8 Flash |
| Artificial Analysis intelligence index · measured runs only | 43.4 | 40.9 | 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 Gemini 3.8 Flash at 47.1 (#18). Claude Haiku 5.5 scores higher on all 2 coding boards that rate both.
| Coding board | Claude Haiku 5.5 | Gemini 3.8 Flash |
|---|---|---|
| LiveBench · Coding | 67.5 | 63.4 |
| Vals Vibe Code Bench | 90.4 | 78.7 |
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.
Gemini 3.8 Flash at a glance
- Developer
- Status
- Live since September 2, 2026
- API price
- $0.75 input / $3.75 output per 1M tokens · Google, gemini-3.8-flash
- Context window
- 1.05M tokens
Live — GA Sep 2 · $0.75/$3.75 per 1M introductory through Dec 31, identical to 3.7 · 1M in / 64K out · 'our most intelligent Flash model' · 20 days after 3.7.
Gemini 3.8 Flash is GA — same price as 3.7, twenty days later
2026-09-02 · Google released Gemini 3.8 Flash today. The Gemini API changelog for September 2 reads: "Gemini 3.8 Flash generally available (GA): Released gemini-3.8-flash, our most intelligent Flash model, engineered for long-horizon software engineering, autonomous agents, and complex enterprise workflows."
Claude Haiku 5.5 vs Gemini 3.8 Flash: quick answers
Which is better, Claude Haiku 5.5 or Gemini 3.8 Flash?
It depends on what you measure. Of the 4 public leaderboards that rate both, Claude Haiku 5.5 scores higher on 2 and Gemini 3.8 Flash on 2. Claude Haiku 5.5's widest lead is on Artificial Analysis; Gemini 3.8 Flash'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 Gemini 3.8 Flash at 47.1 (out of 100).
Which is newer, Claude Haiku 5.5 or Gemini 3.8 Flash?
Claude Haiku 5.5. It went live on October 7, 2026, 35 days after Gemini 3.8 Flash (September 2, 2026).
Which is cheaper, Claude Haiku 5.5 or Gemini 3.8 Flash?
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 Gemini 3.8 Flash is $0.75 input / $3.75 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 Gemini 3.8 Flash?
Gemini 3.8 Flash, at 1.05M tokens against Claude Haiku 5.5's 1M, as each vendor lists it.
How do Claude Haiku 5.5 and Gemini 3.8 Flash compare for coding?
On the ArtificialWatch coding index, Claude Haiku 5.5 is at 73.5 (#11 of 35) and Gemini 3.8 Flash at 47.1 (#18). Claude Haiku 5.5 scores higher on all 2 coding boards that rate both.
Who makes Claude Haiku 5.5 and Gemini 3.8 Flash?
Claude Haiku 5.5 is from Anthropic; Gemini 3.8 Flash is from Google.
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.
More comparisons
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Also: the bench index · API pricing · the wire