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Claude Haiku 5.5 vs GPT-6.1 Terra Pro

Detailed technical comparison between Claude Haiku 5.5 (Anthropic) and GPT-6.1 Terra Pro (OpenAI). Review live API token pricing, context window capabilities, time-to-first-token latency, and verified benchmark scores side-by-side.

⚡ Executive Summary & Verdict

Comparison Snapshot

Claude Haiku 5.5: 0 WinsvsGPT-6.1 Terra Pro: 6 Wins
Context Leader

GPT-6.1 Terra Pro

1,050,000 tokens
Agentic Tool-Calling

Tie

Equal Capability
Lowest Latency (TTFT)

Tie

Equal Speed
Input Price Leader

Claude Haiku 5.5

$0.10 / MTok
Anthropicactive

Claude Haiku 5.5

Claude Haiku 5.5 is Anthropic's small, fast model for high-volume, cost-sensitive work such as summarization, subagents, and browser use. It succeeds Claude Haiku 4.5 with stronger coding, computer use, and...

View Claude Haiku 5.5 Full Specs →
OpenAIactive

GPT-6.1 Terra Pro

GPT-6.1 Terra Pro is the same underlying model as [GPT-6.1 Terra](https://openrouter.ai/openai/gpt-6.1-terra), served with `reasoning.mode` set to `pro` for higher-quality responses on complex tasks. **Cost note:** pro mode spends far more...

View GPT-6.1 Terra Pro Full Specs →

Technical Specifications

🏆 = Superior Spec
SpecificationClaude Haiku 5.5GPT-6.1 Terra Pro
ProviderAnthropicOpenAI
Context Window1,000,000 tokens1,050,000 tokens🏆
Agent SuitabilityNot yet benchmarkedNot yet benchmarked
Time to First Token (TTFT)No public TTFT dataNo public TTFT data
Deployment Modelmanaged apimanaged api
Production StabilityStable releaseNot verified
API AvailableYesYes
Released Date2026-10-072026-10-26

API Pricing Comparison

Input Price per Million Tokens

Claude Haiku 5.5

$0.10

GPT-6.1 Terra Pro

$1.00

Output Price per Million Tokens

Claude Haiku 5.5

$0.50

GPT-6.1 Terra Pro

$5.00

💡 Cost Ratio: Claude Haiku 5.5 is 10.0x cheaper per input token than GPT-6.1 Terra Pro.

Want to test both models live?

Run side-by-side prompt benchmarks in our dynamic multi-model Sandbox. Compare execution speeds, latency metrics, and compute actual costs in real-time.

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Benchmark Performance Metrics

Standardized Scores (0–100%)

Scores show verified raw accuracy percentages across standardized AI evaluation suites. Higher bars indicate superior performance in that domain.

MMLUGeneral knowledge & multi-task understanding
78.4%vs88.4%+10.0% GPT-6.1 Terra Pro
Claude Haiku 5.5
GPT-6.1 Terra Pro 🏆
HumanEvalPython coding & logic synthesis
76.6%vs87.6%+11.0% GPT-6.1 Terra Pro
Claude Haiku 5.5
GPT-6.1 Terra Pro 🏆
MATHComplex mathematical problem solving
53.8%vs65.4%+11.6% GPT-6.1 Terra Pro
Claude Haiku 5.5
GPT-6.1 Terra Pro 🏆
GPQAGraduate-level expert reasoning
39.2%vs46.8%+7.6% GPT-6.1 Terra Pro
Claude Haiku 5.5
GPT-6.1 Terra Pro 🏆
HellaSwagCommonsense reasoning and inference
81.4%vs86.0%+4.6% GPT-6.1 Terra Pro
Claude Haiku 5.5
GPT-6.1 Terra Pro 🏆
MT-BenchMulti-turn conversation flow quality
8.4%vs8.9%+0.5% GPT-6.1 Terra Pro
Claude Haiku 5.5
GPT-6.1 Terra Pro 🏆

Claude Haiku 5.5 Quirks & Gotchas

No developer gotchas reported.

GPT-6.1 Terra Pro Quirks & Gotchas

No developer gotchas reported.

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