Claude Haiku 5.5 vs GPT-5.3 Chat
Claude Haiku 5.5 leads the LLM Stats Score 49.9 to 29.0. Claude Haiku 5.5 is 24.1x cheaper per token.
Anthropic · OpenAI · Updated for 2026
Which is better?
Claude Haiku 5.5 leads the overall LLM Stats Score 49.9 to 29.0, ranking #20 overall.
In the 1 individual benchmarks reported for both models, Claude Haiku 5.5 wins 1; this is a narrower head-to-head signal than the composite indexes.
On price, Claude Haiku 5.5 is roughly 24.1x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Claude Haiku 5.5 also accepts a larger context window (1,000,000 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 5.5
- overall performance matters — it scores 49.9 and ranks #20 on LLM Stats
- you value its reported benchmark strengths — it wins 1 of 1 exact shared results
- cost matters — it's about 24.1x cheaper per token
- you process long inputs — it offers a 1,000,000 token context window
- you want the most recent training data — it shipped Oct 2026
Choose GPT-5.3 Chat
- you want predictable pricing at $1.75/M input and $14.00/M output
At a glance
The differences that matter most.
Individual benchmarks
36 reported for Claude Haiku 5.5 · 2 for GPT-5.3 Chat
Claude Haiku 5.5 outperforms in 1 benchmarks (HealthBench), while GPT-5.3 Chat is better at 0 benchmarks.
Claude Haiku 5.5 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 5.5 ($0.10/1M tokens) is 17.5x cheaper than GPT-5.3 Chat ($1.75/1M tokens).
For output processing, Claude Haiku 5.5 ($0.50/1M tokens) is 28.0x cheaper than GPT-5.3 Chat ($14.00/1M tokens).
In conclusion, GPT-5.3 Chat is more expensive than Claude Haiku 5.5.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Claude Haiku 5.5 accepts 1,000,000 input tokens compared to GPT-5.3 Chat's 128,000 tokens. Claude Haiku 5.5 can generate longer responses up to 128,000 tokens, while GPT-5.3 Chat is limited to 16,384 tokens.
Input capabilities
Documented input modalities across available providers
Both Claude Haiku 5.5 and GPT-5.3 Chat support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Claude Haiku 5.5
GPT-5.3 Chat
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 5.5 was released on 2026-10-07, while GPT-5.3 Chat was released on 2026-03-04.
Claude Haiku 5.5 is 7 months newer than GPT-5.3 Chat.
Oct 7, 2026
1 weeks ago
7mo newerMar 4, 2026
7 months ago
Knowledge Cutoff
When training data ends
Claude Haiku 5.5 has a knowledge cutoff of 2026-06-01, while GPT-5.3 Chat has a cutoff of 2025-08-31.
Claude Haiku 5.5 has more recent training data (up to 2026-06-01), making it potentially better informed about events through that date compared to GPT-5.3 Chat (2025-08-31).
Jun 2026
10 mo newerAug 2025
Provider Availability
Claude Haiku 5.5 is available from Anthropic. GPT-5.3 Chat is available from OpenAI.
Claude Haiku 5.5
GPT-5.3 Chat
Outputs Comparison
Judge for yourself.
Run your own prompts against Claude Haiku 5.5 and GPT-5.3 Chat side-by-side, then vote on the output you prefer.
FAQ
Common questions about Claude Haiku 5.5 vs GPT-5.3 Chat.