Claude Haiku 4.5 vs GPT-5.5 Instant
GPT-5.5 Instant leads the LLM Stats Score 32.1 to 25.6. Claude Haiku 4.5 is 5.6x cheaper per token.
Anthropic · OpenAI · Updated for 2026
Which is better?
GPT-5.5 Instant leads the overall LLM Stats Score 32.1 to 25.6, ranking #120 overall.
In the 2 individual benchmarks reported for both models, GPT-5.5 Instant wins 2; this is a narrower head-to-head signal than the composite indexes.
On price, Claude Haiku 4.5 is roughly 5.6x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
GPT-5.5 Instant also accepts a larger context window (400,000 input tokens), making it the stronger choice for long documents and large codebases.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose Claude Haiku 4.5
- cost matters — it's about 5.6x cheaper per token
Choose GPT-5.5 Instant
- overall performance matters — it scores 32.1 and ranks #120 on LLM Stats
- your work emphasizes reasoning — it leads those capability indexes
- you value its reported benchmark strengths — it wins 2 of 2 exact shared results
- you process long inputs — it offers a 400,000 token context window
- you want the most recent training data — it shipped May 2026
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
12 reported for Claude Haiku 4.5 · 9 for GPT-5.5 Instant
Claude Haiku 4.5 outperforms in 0 benchmarks, while GPT-5.5 Instant is better at 2 benchmarks (AIME 2025, GPQA).
GPT-5.5 Instant significantly outperforms across most benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, Claude Haiku 4.5 ($1.00/1M tokens) is 5.0x cheaper than GPT-5.5 Instant ($5.00/1M tokens).
For output processing, Claude Haiku 4.5 ($5.00/1M tokens) is 6.0x cheaper than GPT-5.5 Instant ($30.00/1M tokens).
In conclusion, GPT-5.5 Instant is more expensive than Claude Haiku 4.5.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
GPT-5.5 Instant accepts 400,000 input tokens compared to Claude Haiku 4.5's 200,000 tokens. GPT-5.5 Instant can generate longer responses up to 128,000 tokens, while Claude Haiku 4.5 is limited to 64,000 tokens.
Input capabilities
Documented input modalities across available providers
Both Claude Haiku 4.5 and GPT-5.5 Instant support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Claude Haiku 4.5
GPT-5.5 Instant
License
Usage and distribution terms
Both models are licensed under proprietary licenses.
Both models have usage restrictions defined by their respective organizations.
Proprietary
Closed source
Proprietary
Closed source
Release Timeline
When each model was launched
Claude Haiku 4.5 was released on 2025-10-15, while GPT-5.5 Instant was released on 2026-05-05.
GPT-5.5 Instant is 7 months newer than Claude Haiku 4.5.
Oct 15, 2025
1.0 years ago
May 5, 2026
5 months ago
6mo newerKnowledge Cutoff
When training data ends
Claude Haiku 4.5 has a knowledge cutoff of 2025-02-01, while GPT-5.5 Instant has a cutoff of 2025-08-31.
GPT-5.5 Instant has more recent training data (up to 2025-08-31), making it potentially better informed about events through that date compared to Claude Haiku 4.5 (2025-02-01).
Feb 2025
Aug 2025
6 mo newerProvider Availability
Claude Haiku 4.5 is available from Anthropic, DeepInfra, Vertex AI. GPT-5.5 Instant is available from OpenAI.
Claude Haiku 4.5
GPT-5.5 Instant
Outputs Comparison
Judge for yourself.
Run your own prompts against Claude Haiku 4.5 and GPT-5.5 Instant side-by-side, then vote on the output you prefer.
FAQ
Common questions about Claude Haiku 4.5 vs GPT-5.5 Instant.