Claude Haiku 4.5 vs GPT-5.6 Terra: pricing and benchmarks
Claude Haiku 4.5 is 50% cheaper on input tokens ($1.00 vs $2.00 per 1M). Claude Haiku 4.5 is 58% cheaper on output tokens ($5.00 vs $12.00 per 1M). On our document Q&A workload (50,000 questions a month), Claude Haiku 4.5 costs $550.00 a month versus $1,160 for GPT-5.6 Terra, 53% less. GPT-5.6 Terra scores 159.1 on the Epoch Capabilities Index vs 142.4 for Claude Haiku 4.5.
Prices verified September 14, 2026.
Which should you choose?
GPT-5.6 Terra scores 159.1 on the Epoch Capabilities Index vs 142.4 for Claude Haiku 4.5.
Claude Haiku 4.5 costs $2.00 per 1M tokens (3:1 input-to-output mix) vs $4.50 for GPT-5.6 Terra, 56% less.
A trade-off: GPT-5.6 Terra is 16.8 ECI points more capable but costs 2.3x as much as Claude Haiku 4.5.
Pricing and specs
| Claude Haiku 4.5 | GPT-5.6 Terra | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| API model ID | claude-haiku-4-5-20251001 | gpt-5.6-terra |
| Input / 1M tokens | $1.00 | $2.00 |
| Cached input / 1M tokens | $0.10 | $0.20 |
| Output / 1M tokens | $5.00 | $12.00 |
| Long-context rates | — | $4.00 in / $18.00 out on long-context requests |
| Context window | 200K tokens | 1.05M tokens |
| Max output | 64K tokens | 128K tokens |
| Batch discount | 50% off | 50% off |
Benchmarks
| Claude Haiku 4.5 | GPT-5.6 Terra | |
|---|---|---|
| Epoch Capabilities Index | 142.4 | 159.1 |
| GPQA Diamond· Science reasoning | 61.6% | 91.1% |
| FrontierMath (Tiers 1–3)· Advanced math | — | 86.0% |
| SimpleQA Verified· Factual accuracy | 13.2% | 43.2% |
| ARC-AGI-2· Abstract reasoning | 4.0% | 83.9% |
| DeepSWE· Coding | — | 69.6% |
| APEX-Agents· Agentic work | 8.9% | — |
Source: Epoch AI, best recorded result per model (CC BY 4.0). A dash means no published score. See all benchmarks
Monthly cost for real workloads
| Workload | Claude Haiku 4.5 | GPT-5.6 Terra | Difference |
|---|---|---|---|
Support chatbot 100,000 replies a month, ~1,500 input tokens (system prompt + history) and ~400 output tokens each. | $350.00 | $780.00 | Claude Haiku 4.5 55% cheaper |
Document Q&A (RAG) 50,000 questions a month with ~8,000 tokens of retrieved context and ~600 output tokens each. | $550.00 | $1,160 | Claude Haiku 4.5 53% cheaper |
Coding agent 10,000 agent steps a month, ~40,000 input tokens each (70% read from the prompt cache) and ~2,000 output tokens. | $248.00 | $536.00 | Claude Haiku 4.5 54% cheaper |
Estimates use standard list prices and ignore cache-write surcharges. Different tokenizers can count the same text differently, so test with your own prompts.
Claude Haiku 4.5 vs GPT-5.6 Terra cost calculator
- $550.00/mo$0.01 / request
- GPT-5.6 TerraOpenAI$1,160/mo$0.02 / request
Standard-tier list prices. Long-context rates apply automatically where the provider publishes a threshold. Excludes cache-write surcharges, taxes, batch and volume discounts.
Claude Haiku 4.5 pricing notes
Anthropic’s fastest model, with near-frontier intelligence.
- Cache writes cost $1.25 (5-minute cache) or $2 (1-hour cache) per 1M tokens.
- Uses Anthropic’s previous tokenizer.
GPT-5.6 Terra pricing notes
The GPT-5.6 model that balances intelligence and cost.
- Cache writes are billed at $2.50 per 1M tokens.
- Fast mode costs 2x the standard rate; Flex costs half.
Frequently asked questions
- Is Claude Haiku 4.5 cheaper than GPT-5.6 Terra?
- Claude Haiku 4.5 is 50% cheaper on input tokens ($1.00 vs $2.00 per 1M). Claude Haiku 4.5 is 58% cheaper on output tokens ($5.00 vs $12.00 per 1M). On our document Q&A workload (50,000 questions a month), Claude Haiku 4.5 costs $550.00 a month versus $1,160 for GPT-5.6 Terra, 53% less.
- Which is more capable, Claude Haiku 4.5 or GPT-5.6 Terra?
- GPT-5.6 Terra scores 159.1 on the Epoch Capabilities Index vs 142.4 for Claude Haiku 4.5.
- How much does Claude Haiku 4.5 cost per 1M tokens?
- Claude Haiku 4.5 costs $1.00 per 1M input tokens and $5.00 per 1M output tokens, and $0.10 per 1M cached input tokens on Anthropic’s standard tier.
- How much does GPT-5.6 Terra cost per 1M tokens?
- GPT-5.6 Terra costs $2.00 per 1M input tokens and $12.00 per 1M output tokens, and $0.20 per 1M cached input tokens on OpenAI’s standard tier.
- Which has the larger context window, Claude Haiku 4.5 or GPT-5.6 Terra?
- GPT-5.6 Terra has the larger context window: 1.05M tokens versus 200K for Claude Haiku 4.5.